JP6079093B2 - Pump device - Google Patents

Description

  The present invention relates to a technology of a pump device that supplies a liquid to a medical water jet knife.

  Conventionally, a technique related to a pump device for supplying a liquid to a medical water jet knife has been known (for example, Patent Document 1 below). The pump device disclosed in Patent Document 1 includes two pump units, and one of the pump units always supplies liquid to the water jet knife, and the other pump unit that does not supply liquid sucks liquid. The control that said.

Special table 2007-507261

  A pump device that supplies liquid to a water jet knife is considered to have to supply liquid stably with a constant supply pressure and supply flow rate for a long period of time. Therefore, for example, in the pump device of Patent Document 1, it has been pointed out that the drive timing of the two pump units must be precisely controlled, and the structure and control of the pump device are complicated. Further, in the case of a pump having only one pump unit, in order to continuously supply liquid to the water jet knife for a long time, the capacity of water that can be accommodated in the pump unit must be increased, resulting in an increase in size. The problem that was said was pointed out. In addition, in order to increase the capacity of water, it is necessary to increase mechanical strength, operating force, and power, respectively, and it has been pointed out that it is difficult to make a practical structure.

  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.

(1) According to an aspect of the present invention, there is provided a pump device that supplies the liquid to a medical water jet knife that discharges the liquid. The pump device includes a pump unit that exclusively performs a suction operation for sucking liquid from the outside; a liquid feed operation for feeding the sucked liquid to the water jet knife; and the suction operation and the liquid feed operation. And a control unit that controls to perform the inhalation operation based on an operation to stop the discharge of the water jet knife by a user. According to the pump device of this aspect, since the control is performed so as to perform the suction operation based on the operation of stopping the discharge of the water jet knife by the user, the pump during the liquid feeding operation while the water jet knife is discharging water. The frequency with which the unit performs the suction operation can be reduced, and water can be stably supplied to the water jet knife by relatively simple control.

(2) In the pump device according to the above aspect, the pump unit includes a plurality of pump units; the control unit controls the pump unit to perform one liquid feeding operation in a predetermined period, and controls the water jet knife. Based on the stop of the discharge, the pump unit that performs the liquid feeding operation next may be switched to another pump unit. According to the pump device of this embodiment, since the pump unit having a plurality of pump chambers and performing the liquid feeding operation is sequentially switched to another pump unit, the water jet knife stops discharging again in a short time. Even when starting the operation, water can be stably supplied to the water jet knife.

(3) In the pump device according to the above aspect, the detection unit that detects the remaining amount of the liquid in the pump unit; and the remaining amount of liquid in the pump unit that performs the liquid feeding operation is less than a predetermined amount. And a notifying unit for notifying the user of information related to the remaining amount when the detecting unit detects. According to the pump device of this embodiment, the user can recognize that the remaining amount of liquid in the pump unit performing the liquid feeding operation has fallen below a predetermined amount, and prompt the user to stop discharging the water jet knife. Can do.

(4) In the pump device according to the above aspect, the notification unit is provided in an operation unit used when the user performs a discharge operation of the water jet knife, and the operability different from a normal discharge operation is provided in the operation unit. The notification may be performed by providing the information. According to the pump device of this form, it is possible to make a notification in an aspect that is easy for the user to recognize, such as the operability of the water jet knife.

(5) In the pump device according to the above aspect, the notifying unit is provided in a medical optical device used by the user while using the water jet knife, and is visually in the visual field of the user in the medical optical device The notification may be performed by: According to this form of the pump device, even when the user is using a medical microscope or a medical telescope, it is possible to make a notification in a manner that the user can easily recognize, such as the user's field of view.

(6) In the pump device according to the above aspect, the notification unit may be provided in the water jet knife and perform the notification by changing a mode of discharge from the water jet knife. According to this form of the pump device, it is possible to make a notification in a mode that is easy for the user to recognize, such as a mode of discharge from the water jet knife.

(7) In the pump device of the above aspect, the notification unit may perform the notification by outputting a notification sound. According to the pump device of this aspect, it is possible to notify in a manner that is easy for the user to recognize.

  A plurality of constituent elements of each aspect of the present invention described above are not indispensable, and some or all of the effects described in the present specification are to be solved to solve part or all of the above-described problems. In order to achieve the above, it is possible to appropriately change, delete, replace with another new component, and partially delete the limited contents of some of the plurality of components. In order to solve part or all of the above-described problems or to achieve part or all of the effects described in this specification, technical features included in one embodiment of the present invention described above. A part or all of the technical features included in the other aspects of the present invention described above may be combined to form an independent form of the present invention.

  Moreover, according to such a form, it is possible to solve at least one of various problems such as downsizing of the apparatus, cost reduction, resource saving, ease of manufacture, and improvement in usability.

  Note that the present invention can be realized in various modes. For example, it can be realized in the form of a water jet knife system, a liquid supply system, a liquid supply method, a pump control method, and the like.

1 is an explanatory diagram for explaining a water jet knife system 10. FIG. It is explanatory drawing explaining inhalation operation | movement and liquid feeding operation | movement. It is explanatory drawing explaining suction liquid feeding control. It is a flowchart which shows the flow of suction | inhalation liquid feeding control. It is explanatory drawing explaining the water jet knife system 10a. It is explanatory drawing explaining inhalation liquid feeding control in 2nd Embodiment. It is explanatory drawing explaining the alerting | reporting by the discharge aspect of a pulse jet.

A. First embodiment:
(A1) System configuration:
FIG. 1 is an explanatory view illustrating a water jet knife system 10 using a pump device as a first embodiment of the present invention. A water jet scalpel is a type of medical scalpel that discharges liquid at a high pressure and performs incision and excision with the discharge pressure. In the present embodiment, water that has been sterilized is used as the liquid to be discharged.

  The water jet knife system 10 includes a water jet knife 20, a pump device 30 that supplies water to the water jet knife 20, and a liquid storage unit 60 that stores water supplied to the water jet knife 20. The water jet knife 20 and the pump device 30 are connected by a pipe 22. The pump device 30 and the liquid storage unit 60 are connected by a pipe 62. The control unit 45 of the pump device 30 includes a foot switch 52 for a user to operate the water jet scalpel system 10, a medical microscope 54 used by the user with the water jet scalpel system 10 as necessary, A speaker 56 and a lamp 58 for notifying the user of various information are connected.

  The water jet knife 20 includes a pulse water flow generation unit (not shown) having a piezo element as a driving force. The water jet knife 20 drives the piezoelectric element at a predetermined frequency to discharge the water supplied from the pump device 30 to the outside in the form of a pulsed high-pressure jet water flow (pulse jet PJ). The water jet knife 20 is connected to the control unit 45, and the control unit 45 operates the water jet knife 20 and the pump device 30 in synchronization in accordance with the operation of the foot switch 52 by the user. Specifically, when the user performs an operation of discharging the pulse jet PJ from the water jet knife 20 using the foot switch 52, the control unit 45 drives the pump device 30 to supply water to the water jet knife 20. At the same time, the water jet knife 20 is controlled to supply the supplied water as a pulse jet PJ to be discharged to the outside.

  The pump device 30 functions as a positive displacement liquid supply pump. The pump device 30 includes a drive mechanism 32 and a control unit 45. The drive mechanism 32 is a drive unit that actually sucks water from the liquid storage unit 60 and sends water to the water jet knife 20. The drive mechanism 32 includes a pump unit 34 having a cylinder 35 and a plunger 39, a drive motor 40 that is a power source of the drive mechanism 32, and a rotational motion of the drive motor 40 for converting the plunger 39 to a reciprocating motion. A gear 42 and a drive pinion 44 are provided.

  The drive motor 40 is a stepping motor and rotates at a predetermined rotation speed under the control of the control unit 45. When the drive motor 40 rotates, the rotational force is transmitted to the drive pinion 44 via the gear 42. The plunger 39 is threaded (male thread) and is screwed into the female thread portion of the drive pinion 44. Therefore, the rotational force of the drive pinion 44 is transmitted to the plunger 39 as a force in a direction perpendicular to the pinion rotation surface via the screw structure of the plunger 39. The controller 45 controls the forward and backward movements of the plunger 39 by controlling the rotation direction of the drive motor 40. The pump unit 34 performs a suction operation for sucking water from the liquid storage unit 60 and a liquid feed operation for feeding water to the water jet knife 20 by reciprocating movement of the plunger 39. Hereinafter, the suction operation and the liquid feeding operation performed by the pump unit 34 will be described.

  FIG. 2 is an explanatory diagram for explaining the suction operation and the liquid feeding operation performed by the pump unit 34. FIG. 2A shows the state of the suction operation performed by the pump unit 34, and FIG. 2B shows the state of the liquid feeding operation performed by the pump unit 34. First, the configuration of the pump unit 34 will be described with reference to FIG. The pump unit 34 has a piston structure composed of a cylinder 35 and a plunger 39, and a pump chamber 36 for containing water is formed between the cylinder 35 and the plunger 39. The cylinder 35 is provided with suction ball valves 37a and 37b and discharge ball valves 38a and 38b so that water flows in one direction by the suction operation and the liquid feeding operation by the pump unit 34. By providing two ball valves each, it is possible to reliably perform opening and closing as a valve.

  When the suction operation is performed by the pump unit 34, the control unit 45 controls the rotation direction of the drive motor 40 to move the plunger 39 in the suction direction shown in FIG. When the plunger 39 moves in the suction direction, the volume of the pump chamber 36 is increased, the suction ball valves 37a and 37b are opened, and the discharge ball valves 38a and 38b are closed, and are stored in the liquid storage unit 60. Water is sucked into the pump chamber 36. The inhalation operation is performed in this way.

  On the other hand, when the liquid feeding operation is performed by the pump unit 34, the control unit 45 controls the rotation direction of the drive pinion 44 and moves the plunger 39 in the liquid feeding direction shown in FIG. When the plunger 39 moves in the liquid feeding direction, the volume of the pump chamber 36 is reduced, the suction ball valves 37a and 37b are closed, and the discharge ball valves 38a and 38b are opened. The stored water is sent to the water jet knife 20. In this way, the pump unit 34 performs the suction operation and the liquid feeding operation.

  Next, the suction operation and liquid feeding operation control (hereinafter also referred to as suction liquid feeding control) performed by the control unit 45 will be described. FIG. 3 is an explanatory diagram for explaining the suction liquid feeding control performed by the control unit 45. FIG. 3 shows an ON / OFF state of the foot switch 52 by the user's stepping operation, a state of launching / stopping the pulse jet PJ from the water jet knife 20, and an intake operation and a liquid supply operation controlled by the control unit 45. The horizontal axis is time T. Note that the ON / OFF state of the foot switch 52 shown in FIG. 3 shows an example of a stepping operation performed by the user.

  Further, the timing of the suction operation and the liquid supply operation controlled by the control unit 45 is shown by a graph in which the vertical axis indicates the water accommodation state of the pump chamber 36. A one-dot chain line on the graph indicates that the pump unit 34 performs the suction operation under the control of the control unit 45. A two-dot chain line on the graph indicates that the pump unit 34 is performing a liquid feeding operation under the control of the control unit 45. FIG. 3 shows the time T = 0 when the user turns on the main power supply (not shown) of the pump device 30. Furthermore, for convenience of explanation, the time T shown in FIG. 3 is divided into periods t11 to t15.

  As shown in the drawing, when the user turns on the main power supply, the control unit 45 starts the suction liquid feeding control and causes the pump unit 34 to perform the suction operation. The pump chamber 36, which is empty as an initial state, becomes full due to the suction operation by the pump unit 34 (period t11). When the user turns on the foot switch 52 after the pump chamber 36 is full, the control unit 45 causes the pump unit 34 to perform a liquid feeding operation (period t12). As described above, since the pump device 30 is a positive displacement pump, the water stored in the pump chamber 36 decreases at a constant rate as time passes. The water jet knife 20 emits water supplied by the liquid feeding operation of the pump unit 34 as a pulse jet.

  Thereafter, when the user turns off the foot switch 52, the control unit 45 immediately reverses the rotation direction of the drive motor 40 and causes the pump unit 34 to perform the suction operation (period t13). At this time, the amount of water per unit time sucked into the pump chamber 36 by the suction operation is larger than the amount of water per unit decreased from the pump chamber 36 by the liquid feeding operation. In other words, the water suction speed by the pump unit 34 is faster than the liquid feeding speed. In this embodiment, the suction speed is sufficiently faster than the liquid feeding speed. This is realized by controlling the rotational speed of the drive motor 40 or by making the suction-side flow path diameter of the cylinder 35 larger than the liquid-feeding flow path diameter.

  When the user turns on the foot switch 52 again after the pump chamber 36 is full due to the suction operation by the pump unit 34, the control unit 45. The pump unit 34 is caused to perform a liquid feeding operation (period t14). In a period t14, if the user continuously uses the water jet knife 20 by turning the foot switch 52 on for a long time, and the remaining amount of water stored in the pump chamber 36 is less than the predetermined amount α. The control unit 45 notifies the user that the remaining amount of water in the pump chamber 36 is α or less (notification 1). The predetermined amount α is a value set in the control unit 45 in advance. The predetermined amount α may be defined as the amount (volume) of water, or may be defined as the ratio of the remaining amount of water to the volume of the pump chamber 36 (for example, 10% of the volume of the pump chamber 36). The remaining time until the water in the pump chamber 36 runs out may be defined.

  Specifically, the control of the remaining amount of water stored in the pump chamber 36 is performed by the control unit 45 based on the rotational speed of the drive motor 40. The controller 45 calculates the remaining amount of water in the pump chamber 36 from the number of rotations of the drive motor 40 that is rotated to move the plunger 39 in the liquid feeding direction. Then, when the calculated remaining amount of water becomes α or less, the control unit 45 controls the speaker 56 to output a notification sound to notify the user that the remaining amount is α or less. In this embodiment, a method for outputting a notification sound from the speaker 56 is adopted as a method for notifying the user. However, the present invention is not limited to this, and other methods may be adopted. For example, the notification may be made to the user by changing the operability of the foot switch 52 operated by the user or by changing the operability of the foot switch 52 operated by the user. For example, the elastic force when the foot switch 52 is depressed is made larger than usual, and notification is made using the sense of the user's foot. This can be realized by incorporating a hydraulic piston into the foot switch 52 and controlling the hydraulic pressure of the hydraulic piston by the control unit 45. In this case, the user can recognize the remaining amount of water as a tactile sensation.

  In a period t14, after the remaining amount of water in the pump chamber 36 becomes equal to or less than α, when the user continuously turns on the foot switch 52, the water in the pump chamber 36 is finally empty. When the pump chamber 36 is in an empty state, even if the foot switch 52 is in the ON state, there is no water to be fed to the water jet knife 20, so the pulse jet from the water jet knife 20 stops.

  When the control unit 45 detects from the cumulative number of rotations of the drive motor 40 that the water in the pump chamber 36 is empty, even if the user steps on the foot switch 52, the control unit 45 outputs a signal from the foot switch 52 as a control. The pump unit 34 is forcibly turned off to perform the suction operation (period t15). Further, the control unit 45 notifies the user that the pump chamber 36 is in an empty state through the speaker 56 and the lamp 58 (notification 2). Thereafter, when the water in the pump chamber 36 becomes full due to the suction operation, the control unit 45 sends the water to the pump unit 34 when the foot switch 52 is turned on, as in the control in the period t12 and the period t14. Perform liquid operation. In this way, the control unit 45 performs suction liquid feeding control.

  Next, the suction liquid feeding control will be described with reference to a flowchart. FIG. 4 is a flowchart showing the flow of suction liquid feeding control. As described above, the suction liquid feeding control is started when the user turns on the main power supply of the water jet knife system 10. When starting the suction liquid feeding control, the control unit 45 confirms that the user has not turned on the foot switch 52 (step S102: NO), and sucks into the pump unit 34 until the pump chamber 36 becomes full. An operation is performed (step S104, step S106). The control unit 45 allows the user to turn on the foot switch 52 not only when the pump chamber 36 is full but also when the pump chamber 36 is not full during the suction operation. Then (step S102: YES), the pump unit 34 is caused to perform a liquid feeding operation (step S108). By setting it as such control, a user's operation can be given top priority in the condition where the water jet knife system 10 is used.

  Thereafter, the control unit 45 checks the remaining amount of water in the pump chamber 36 by managing the rotational speed of the drive motor 40 (step S110). At this time, if the remaining amount of water in the pump chamber 36 is less than or equal to the predetermined amount α (step S110: YES), the control unit 45 informs the user that the remaining amount is less than α by the speaker 56 and the lamp 58. Notification is made (step S112).

  And the control part 45 confirms whether the residual amount of the pump chamber 36 is an empty state, and when it is not an empty state (step S114: NO), it is a step until a user turns OFF the foot switch 52. The processing from S108 to S114 is repeated to cause the pump unit 34 to continue the liquid feeding operation (step S116: NO). When the user turns off the foot switch 52 (step S114: NO → step S116: YES), the control unit 45 performs the suction operation on the pump unit 34 until the user turns on the foot switch 52 next time. (Step S102: NO → Step S104 → Step S106).

  When the user turns on the foot switch 52 continuously for a long time, the pump chamber 36 is emptied by the long-time liquid feeding operation by the pump unit 34 (step S114: YES). In this case, the control unit 45 notifies the user that the pump chamber 36 has been emptied (step S118), and even if the user steps on the foot switch 52, the control signal from the foot switch 52 is forced. (Step S120). Thereafter, the control unit 45 causes the pump unit 34 to perform a suction operation until the user steps on the foot switch 52 again to turn it on (step S102: NO → step S104 → step S106). The control unit 45 repeatedly performs the above-described suction liquid feeding control until the user turns off the main power supply of the water jet knife system 10. The suction liquid feeding control has been described above using the flowchart.

  As described above, the pump device 30 supplies water to the water jet knife 20 by suction liquid feeding control. In the suction liquid feeding control of the present embodiment, when the pulse jet PJ is discharged from the water jet knife 20, a constant amount of water is always stably supplied to the water jet knife 20, so that the water jet knife 20 is supplied. No pulsating flow is generated in the water. As a result, the water jet knife system 10 can discharge a pulse jet PJ having a stable water flow, water pressure, and no pulsating flow from the water jet knife 20. In addition, the pump device 30 of the present embodiment includes one pump unit 34, and the suction liquid feeding is performed by a relatively simple process such as causing the pump unit 34 to perform a suction operation when the user turns off the foot switch 52. Control can be realized.

  The pump device 30 according to the present embodiment is provided with one pump unit 34 by the user, and performs a suction operation when the user turns off the foot switch 52. Therefore, the pump device 30 is compared with a conventional pump device having only one pump unit. Thus, the capacity of the pump chamber can be reduced. As a result, the pump device 30 can be reduced in size and can be simplified structurally.

B: Second embodiment:
A second embodiment according to the present invention will be described. FIG. 5 is an explanatory diagram illustrating a water jet knife system 10a according to the second embodiment. The difference in configuration between the first embodiment and the second embodiment is that the water jet knife system 10a includes two drive mechanisms. Specifically, the pump device 30a in the water jet knife system 10a includes a drive mechanism 32a and a drive mechanism 32b. The internal configuration of the drive mechanisms 32a and 32b is the same as the configuration of the drive mechanism 32 described with reference to FIG. In the following description, when expressing the internal configuration of the drive mechanism 32a, “a” is added to the end of the symbol (for example, the pump unit 34a), and when expressing the internal configuration of the drive mechanism 32b, the suffix of the symbol is added. "B" is attached to (for example, pump unit 34b). In addition, the water jet knife system 10a includes two drive mechanisms, and also uses a pipe 22a and a pipe 62a that are branched pipes.

Next, suction liquid feeding control in the second embodiment will be described by taking a specific operation pattern of the foot switch 52 by the user as an example. FIG. 6 shows the suction liquid feeding control performed by the control unit 45 in accordance with the operation pattern of the foot switch 52 by the user. The features of the suction liquid feeding control in the second embodiment are as follows.
(1) There is one pump unit that performs the liquid feeding operation at a time. Multiple pump units do not feed simultaneously.
(2) When the foot switch 52 is turned off, the pump unit that has been performing the liquid feeding operation is caused to perform the suction operation.
(3) The pump unit is switched when the foot switch 52 is turned off.
The control unit 45 performs suction liquid feeding control having the features (1) to (3).

  As shown in FIG. 6, when the user turns on the main power supply, the control unit 45 causes the pump units 34a and 34b to perform a suction operation. The pump chambers 36a and 36b, which are empty as the initial state, are filled with water by the suction operation of the pump units 34a and 34b (period t21). When the user turns on the foot switch 52 after the pump chambers 36a and 36b are full, the control unit 45 causes the pump unit 34a to perform a liquid feeding operation (period t22). During this period, the pump unit 34b is stopped in a full water state. Thereafter, when the user turns off the foot switch 52, the control unit 45 causes the pump unit 34a to perform a suction operation (period t23).

  Thereafter, when the user turns on the foot switch 52 again, the control unit 45 switches the pump unit that performs the liquid feeding operation, and causes the pump unit 34b to perform the liquid feeding operation (period t24). After that, when the user turns off the foot switch 52 for a short time (period t25) and turns on the foot switch 52 again, the control unit 45 switches the pump unit that performs the liquid feeding operation, and switches to the pump unit 34a. The liquid feeding operation is performed (period t26).

  As described above, the water jet knife system 10a in the second embodiment includes two pump units. Therefore, even when the time for the user to turn off the foot switch 52 is shorter than the time required for the pump unit 34b to fill the pump chamber by the suction operation as in the period t25 in FIG. When the pump unit 34a is switched from the pump unit 34b to the pump unit 34a, the liquid feeding operation can be performed by the pump unit 34a in the full water state when the liquid feeding operation is performed next time. Accordingly, even when the foot switch 52 is OFF for a short time, it is possible to ensure continuous use of the water jet knife 20 for a certain time each time.

C. Variations:
The present invention is not limited to the above-described embodiments and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.
(C1) Modification 1:
In the second embodiment, a water jet knife system including two pump units is employed as an example including a plurality of pump units. However, the present invention is not limited thereto, and the number of pump units is three or four. The number of arbitrary pump units of 2 or more may be adopted as long as possible. By doing in this way, water can be further stably supplied to the water jet knife 20.

Even in this case, as in the second embodiment, the same effects as in the above embodiment can be obtained by performing suction liquid feeding control incorporating the following features.
(1) There is one pump unit that performs the liquid feeding operation at a time. Multiple pump units do not feed simultaneously.
(2) When the foot switch 52 is turned off, the pump unit that has been performing the liquid feeding operation is caused to perform the suction operation.
(3) The pump unit is switched when the foot switch 52 is turned off.

  In the case where three or more units are provided, various aspects can be adopted as the feature (3). For example, when four pump units 34a to 34d are provided, the pump unit switching pattern may be switched sequentially such as 34a → 34b → 34c → 34d, or may be switched according to a predetermined rule. However, it may be switched out of order.

(C2) Modification 2:
In the above embodiment, as a notification method to the user when the user continuously uses the water jet knife 20 and the remaining amount of water stored in the pump chamber 36 is equal to or less than the predetermined amount α, the speaker 56 Although a notification method for outputting a notification sound, a notification method for turning on or blinking the lamp 58, and a notification method for changing the operability of the foot switch 52 are employed, various notification methods can be employed. For example, a notification means in a mode that allows the user to visually recognize the eyepiece of the microscope 54 while wearing the eyepiece of the microscope 54 in the field of view of the user of the medical microscope 54 used when the user uses the water jet knife system 10. It may be adopted. In this case, it can be realized by incorporating a lamp or a liquid crystal display in the microscope 54 that is normally used by the user. In this way, the user can visually recognize that the remaining amount of water has reached a predetermined amount while using the microscope. In addition, when a user uses medical binoculars or a telescope instead of a medical microscope as a medical optical device, as in the case of a microscope, the user's field of view with a video or flashing light, It is good also as showing the alerting | reporting means of the aspect which a user can visually recognize.

  As another notification means, the discharge mode of the pulse jet PJ discharged from the water jet knife 20 may be changed to a different discharge mode. FIG. 7 is an explanatory diagram for explaining notification by changing the discharge mode of the pulse jet PJ. FIG. 7A shows a normal discharge mode (normal mode) of the pulse jet PJ. FIG. 7B shows a specific example 1 (notification mode 1) of the discharge mode of the pulse jet PJ when notification is performed. In the notification mode 1, the notification is performed by lowering the frequency of the pulse jet PJ than usual. FIG. 7C shows a specific example 2 (notification mode 2) of the discharge mode of the pulse jet PJ when notification is performed. The notification mode 2 is a discharge mode in which a period in which the pulse is periodically stopped is incorporated between normal continuous pulses having a constant frequency. By changing the discharge mode of the pulse jet PJ in this way, it is possible to recognize that the remaining amount of water has become a predetermined amount or less as a hand feeling that the user is operating the water jet knife 20. Moreover, you may apply combining each alerting | reporting means demonstrated above suitably.

(C3) Modification 3:
In the above embodiment, as a means for detecting the remaining amount of water stored in the pump chamber 36, the controller 45 employs a means for calculating from the number of rotations of the drive motor 40. An optical sensor that detects the length inserted into the cylinder 35 is provided, or a limit switch for detecting the remaining amount that is turned on when the plunger 39 is inserted into the cylinder 35 more than a predetermined length is planned with the cylinder 35. The remaining amount of water can be detected by various modes such as providing between the jar 39 and the like.

(C4) Modification 4:
In the above embodiment, water is used as the liquid used in the water jet scalpel system. However, the present invention is not limited to this, and various liquids such as physiological saline and weakly viscous oil can be used.

(C5) Modification 5:
In addition, as described in the above embodiment, the pump device including only one pump unit is very effective compared to the conventional pump device from the viewpoints of downsizing and simplification of processing. That is, it is good also as following structures. A pump device for supplying a liquid to a medical water jet knife that discharges the liquid. The suction operation for sucking the liquid from the outside and the liquid feeding operation for feeding the sucked liquid to the water jet knife are exclusive. And a control unit that controls a suction operation and a liquid feeding operation, and a control unit that controls the suction unit to perform the suction operation based on an operation to stop the discharge of the water jet knife by the user. The pump device may include only one pump unit.

DESCRIPTION OF SYMBOLS 10, 10a ... Water jet knife system 20 ... Water jet knife 22, 62, 22a, 62a ... Piping 30, 30a ... Pump apparatus 32, 32a, 32b ... Drive mechanism 34, 34a, 34b ... Pump unit 35 ... Cylinder 36, 36a ... Pump chamber 37a, 37b ... Suction ball valve 38a, 38b ... Discharge ball valve 39 ... Plunger 40 ... Drive motor 42 ... Gear 44 ... Drive pinion 45 ... Control unit 52 ... Foot switch 54 ... Microscope 56 ... Speaker 58 ... Lamp 60 ... Liquid container PJ ... Pulse jet

Claims (6)

A pump device for supplying the liquid to a medical water jet scalpel that discharges the liquid,
A pump unit that exclusively performs a suction operation for sucking a liquid from the outside and a liquid feeding operation for feeding the sucked liquid to the water jet knife;
A control unit that controls the suction operation and the liquid feeding operation, and a control unit that controls to perform the suction operation based on an operation of stopping the discharge of the water jet knife by a user .
The pump unit is plural,
The control unit performs control so that the number of pump units that perform the liquid feeding operation is one during a predetermined period, and the pump unit that performs the liquid feeding operation next based on the stop of the discharge of the water jet knife. Pump device that switches to other pump units. A claim 1 Symbol placement of the pump, and further,
A detection unit for detecting the remaining amount of the liquid of the pump unit;
A pump device comprising: a notifying unit for notifying the user of information relating to the remaining amount when the detecting unit detects that the remaining amount of liquid in the pump unit performing the liquid feeding operation is less than a predetermined amount. . The pump device according to claim 2 ,
The notification unit is provided in an operation unit used when the user performs a discharge operation of the water jet knife, and performs the notification by providing the operation unit with an operability different from a normal discharge operation. . The pump device according to claim 2 or 3 , wherein
The said notification part is provided in the medical optical apparatus which the said user uses while using the said water jet knife, The pump apparatus which performs the said notification by the visual aspect in the said user's visual field in this medical optical apparatus. The pump device according to any one of claims 2 to 4 ,
The said alerting | reporting part is provided in the said water jet scalpel, The pump apparatus which performs the said alerting | reporting by changing the aspect of discharge from the said water jet scalpel. The pump device according to any one of claims 2 to 5 ,
The said alerting | reporting part performs the said alerting | reporting by outputting an alerting | reporting sound. Pump apparatus.

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