JP2607126B2 - Physiological saline pressurizing device and its pressure control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a physiological saline pressurizing apparatus for pressurizing a physiological saline to be supplied to a surgical handpiece for performing incision, resection, irrigation and the like by ejecting a fluid. And its pressure control device.

[Prior Art] In recent years, a method of using a pressurized fluid jet for a limited area has been studied in order to improve various surgical methods. For example, a surgical handpiece used in this method is disclosed in These are disclosed in JP-A-61-24013, JP-B-62-13604, JP-B-62-32009, JP-A-62-32010 and the like.

In the method using the pressurized fluid jet, it is only possible to release from the surrounding tissue without cutting the cords such as the vascular system by adjusting the pressure and the injection amount to an appropriate range. Rather, the loose tissue can be removed from the treatment site together with the ejected fluid. And its application range is wide, incision using high pressure such as 10MPa, cutting, or 1MPa
It can be used for exfoliation using a pressure lower than a or lower, separation of parenchyma cells and cords at flexible sites, washing, and the like.

In the method of using the pressurized fluid jet, a conventional method of pressurizing the physiological saline to be injected is, for example, as shown in FIG. I'm pressing. The pressurized physiological saline is sent to the handpiece 2 through the switching valve 42 and the hose 43, and is injected toward the operation site through the nozzle 3 in the handpiece 2. On the other hand, the fluid at the operative site and its surroundings is sucked from the suction port of the nozzle unit 3 to the suction device 45 via the suction hose 44.

In using this pressurized fluid jet, a pump for pressurizing physiological saline requires the following.

A desired pressure according to the application is easily obtained, and the pressure is stable.

There are few liquid-contact parts that come into direct contact with physiological saline, and that part can be easily sterilized.

Sterile and non-sterile parts must not come into contact at any time.

 Easy to operate and safe.

[Problem to be Solved by the Invention] In the method of pressurizing the physiological saline with the piston pump 41, a stable pressure can be easily obtained, but the structure of the piston pump 41 itself is complicated, so that many liquid contact parts are provided. In addition, there is a disadvantage that the sterilization operation of the portion cannot be easily performed.

The present invention has been made in order to solve such a disadvantage, and an object of the present invention is to provide a physiological saline pressurizing apparatus which has a small number of liquid contact parts and is easy to operate. Another object of the present invention is to provide a pressure control device capable of stably obtaining a desired pressure by using the physiological saline pressurizing device.

[Means for Solving the Problems] A physiological saline pressurizing apparatus according to the present invention includes a cylinder lid for mounting an outlet of a soft container containing a physiological saline to be supplied to a surgical handpiece, and a cylinder lid attached to the cylinder lid. A cylinder for inserting the soft container, a piston fitted into the cylinder and pressing the bottom surface of the soft container, a feeder connected to the piston to move the piston,
And a motor for driving the feeder.

Further, the pressure control device of the physiological saline pressurizing device includes a pressure detector that detects the pressure of the physiological saline supplied to the surgical handpiece, and a pressure detector that detects the pressure detected by the pressure detector in advance. A first comparing means for generating an output when the pressure exceeds a first pressure, and a difference between a pressure detected by the pressure detector and a target pressurized pressure set to be higher than the first pressure. The output of the second comparison means, and when no output is generated from the first comparison means, the set rotation speed of the motor is maintained at a high speed, and when the first comparison means generates an output, the set rotation speed of the motor is maintained. Setting speed switching for switching the speed from high speed to low speed, and further, upon receiving a deviation output from the second comparing means, when the pressure detected by the pressure detector exceeds the target pressurization pressure, switching the set rotation speed of the motor to zero. Means, characterized in that a speed control means for controlling the rotational speed of the motor by the deviation from the set rotation speed output and a second comparator means from the set speed switching means.

[Operation] In the present invention, the soft container containing the physiological saline is directly pressurized into the cylinder with a piston, so that the physiological saline in the soft container is pressurized and sent directly to the handpiece.

Further, in the present invention, when pressurizing the physiological saline, the pressure of the physiological saline is detected, and the speed of moving the piston is switched based on the detected pressure, thereby stabilizing the pressure of the physiological saline.

Embodiment FIG. 1 is a cross-sectional view showing the structure of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a commercially available container containing physiological saline. The container 1 is, for example, a flexible container made of a cylindrical synthetic resin having a liquid outlet part 4 sealed at the upper part as shown in FIG. Reference numeral 5 denotes a cylinder lid for attaching the liquid outlet 4 of the container 1, and 6 denotes a cylinder. The inner diameter of the cylinder 6 is formed so that the container 1 can be loosely inserted. 7 is a piston provided in the cylinder 6, 8 is a ball screw attached to the piston 7 to move the piston 7 in the cylinder 6, 9 is a guide attached to the ball screw 8, and 10 is a guide shaft on which the guide 9 slides. is there. Reference numeral 11 denotes a servomotor for moving the ball screw 8, and the servomotor 11 is connected to the ball screw 8 by a transmission mechanism such as a pulley 12, a belt 13 or a gear. Reference numeral 15 denotes a limit switch for detecting the bottom dead center of the piston 7, and 16 denotes a limit switch for detecting the top dead center of the piston 7. Reference numeral 17 denotes a high-pressure hose connected between the liquid outlet 4 of the container 1 and the handpiece 2 to send the physiological saline in the container 1 to the handpiece 2, reference numeral 18 denotes a pressure detector mounted in the middle of the high-pressure hose 17, Is a control device for controlling the servomotor 11 based on the pressure of the physiological saline detected by the pressure detector 18.

The operation when the physiological saline in the container 1 is pressurized by the physiological saline pressurizing device configured as described above will be described.

First, the liquid outlet 4 of the container 1 containing the physiological saline is attached to the cylinder-equipped cylinder 5 via the elastic body 20 conforming to the shape of the container 1, the container 1 is inserted into the cylinder 6, and the liquid outlet 4 is connected to the hunt piece 2 via a high-pressure hose 17.

Next, the servomotor 11 is driven to move the ball screw 8 along the guide shaft 10 to move the piston 7 forward. When the piston 7 moves forward and reaches the bottom of the container 1, pressurization of the container 1 starts. Since the container 1 is formed of a soft material having flexibility, when pressurized by the piston 7, the outer periphery of the container 1 is sealed with the inner wall of the cylinder 6. When the container 1 is further pressurized by the piston 7 in this state, the container 1
The pressure is evenly transmitted to the entire outer periphery through saline.
In addition, since the entire outer peripheral portion of the container 1 is tightly surrounded by the inner wall of the cylinder 6 and the elastic body 20, the physiological saline in the container 1 can be pressurized without bursting the container 1. As the pressurized physiological saline is ejected from the handpiece 2 and consumed, the bottom of the container 1 is pushed up by the piston 7, and the container 1 is maintained while maintaining the pressure equilibrium as shown in FIG. It gradually shrinks. When the amount of the physiological saline in the container 1 reaches a certain amount, the pressurization by the piston 7 is stopped.

When the physiological saline in the container 1 is pressurized, the pressure of the pressurized physiological saline is detected by a pressure detector 18, and the rotation speed of the servomotor 11 is controlled by the detected pressure. Therefore, the pressure of the physiological saline injected from the handpiece 2 can always be maintained at a predetermined pressure.

Then, pressure control when pressurizing the physiological saline in the container 1 will be described next.

FIG. 4 is a block diagram of the control device 19 shown in FIG. 1. In FIG. 4, reference numeral 21 denotes a setting device for setting a pressurizing pressure of a physiological saline solution and a rotation speed of a servomotor, and 22 denotes a set pressure and the like. A display for displaying, 23 is an AD converter for converting an analog signal of the pressure detected by the pressure detector 18 into a digital signal, 24
Denotes an interface circuit, 25 denotes an arithmetic unit, and 26 denotes a servo amplifier for driving the servomotor 11. 27 is a servo motor
A pulse encoder attached to the drive shaft 11 and an FV converter 28 for converting the signal of the pulse encoder 27 into a voltage signal.

FIG. 5 is a block diagram showing the configuration of the calculation unit 25 shown in FIG. 4. In FIG. 5, reference numeral 29 denotes the pressure P of the physiological saline detected by the pressure detector 18 and the pressure P set in the setting unit 21 in advance. The first to compare with the low set pressure P _{1 of} about 3Kgf / cm ²
30 is a second comparator for comparing the pressure P of the physiological saline with, for example, 30 kgf / cm ² and a preset target pressurization pressure P ₂ according to the use of the handpiece 2, and 31 is a second comparator. The signals from the first comparator 29 and the second comparator 30 allow the setting unit 21
Rotation speeds ω _H , ω _L , ω of the servo motor 11 set to
Setting speed switch for switching _O. A speed controller 32 feedback-controls the rotation speed of the servo motor 11 based on the feedback signal from the pulse encoder 27 based on the set rotation speed sent from the set speed switch 31 and the deviation output from the second comparator 30. is there.

The operation of the controller 19 configured as described above
This will be described with reference to the characteristic diagrams of the pressurization time and the discharge pressure shown in the drawing.

First, after mounting the container 1 containing the physiological saline in the cylinder 6, the servomotor 11 is driven to raise the piston 7. When the piston 7 starts to rise, the pressure detector
18 by the detected pressure gives the first set pressure P ₁ fast setting rotational speed omega _H to the servo motor 11 on the condition that does not reach the high-speed motor 11 is rotated at omega _H piston 7 by a feedback control To raise. The piston 7 that has risen at a high speed contacts the bottom of the container 1 and presses the container 1, and the pressure P of the physiological saline in the container 1 is reduced to a first predetermined pressure P of about 3 kgf / cm ^2. _When it reaches ₁ ,
A “high” level signal is sent from the first comparator 29 to the set speed switch 31. Set speed switching unit 31 receives the signal when sending the setting rotational speed of the servo motor 11 to speed controller 32 to switch from the high-speed omega _H to the low speed omega _L, thus the low speed omega _L of rotation of the motor 11 by feedback control Then, the rising speed of the piston 7 is switched to a low speed, and the physiological saline in the container 1 is gradually pressurized. By gradually increasing the pressure by the piston 7 as described above, the container 1 can be uniformly brought into close contact with the inner wall of the cylinder 6, and the saline can be pressurized while preventing the container 1 from being damaged.

While gradually pushing up the container 1 by the piston 7, the saline is pressurized, the pressure P of saline reaches the applied pressure P ₂ set in advance, the deviation output from the second comparator 30 is 0 In response to this, the set speed switch 31
Changes the set rotation speed of the servo motor 11 from the low speed ω _L to ω _O =
Switch to 0. Thereby, the setting signal of the feedback loop of the motor 11 commands the stop of the motor,
Therefore, the lifting of the piston 7 is stopped. The pressurized physiological saline is ejected from the handpiece 2 and consumed, and during this injection, the pressure detector 18 detects the pressure P of the physiological saline.
While detecting the motor feedback control deviation output from the second comparator 30 always variably controls the ascending speed of the piston 7 so that a predetermined applied pressure P ₂ is maintained.

When the pressure P of the saline is controlled to a predetermined applied pressure P _2, in the conventional servo system when the overshoots the target value has occurred performs control of returning to the negative side. However, considering the strength of the container 1 made of synthetic resin, frequent negative control is disadvantageous. So as command omega _O speed zero is output from the set speed switching unit 31 when the pressure P of saline exceeds a predetermined applied pressure P _2, the moving speed of the piston 6 can be constantly positive direction or zero Either. FIG. 7 shows pressure fluctuation data when the injection and the stoppage of the saline controlled by the handpiece 2 are controlled discontinuously.

While controlling the pressure P, a physiological saline solution is injected from the handpiece 2, and when the amount of the physiological saline solution in the container 1 reaches a certain level, the amount is adjusted by the top dead center limit switch 15 of the piston 7. It detects and displays it on the display 22 to issue an alarm. This is because it is impossible to crush the container 100% due to the structure of the container 1 and also to prevent the container 1 from being damaged. Incidentally, the physiological saline in the container 1 was 10
A 950 cc jet could be injected in a 00 cc container 1.

[Effects of the Invention] As described above, the present invention directly pressurizes physiological saline in a soft container by directly pressing the soft container containing saline with a piston in a cylinder. Since the pressure is sent to the handpiece, pressure can be applied without bringing the pressurizing section into contact with physiological saline.
Therefore, it is possible to discharge while maintaining the sterilized state of the physiological saline.

Further, when pressurizing the saline, the pressure of the saline is detected, and the pressure of the saline is controlled by switching the moving speed of the piston based on the detected pressure.
The pressure can be controlled with high precision without damaging the container containing the physiological saline.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention, FIG. 2 is a sectional view showing a container of physiological saline, FIG. 3 is a sectional view showing the operation of the above embodiment, and FIG. FIG. 5 is a block diagram showing a calculation unit of the control device, FIG. 6 is a characteristic diagram of pressurization time and discharge pressure, and FIG. 7 is a pressure fluctuation characteristic diagram according to the above embodiment. FIG. 8 is a layout diagram showing a conventional command. 1 ... container, 2 ... handpiece, 4 ... liquid outlet, 5
…… Cylinder lid, 6… Cylinder, 7… Piston, 8
…… Ball screw, 9 …… Guide, 10 …… Guide shaft, 11…
... Servo motor, 17 ... High pressure hose, 18 ... Pressure detector, 19 ... Control device, 20 ... Elastic body, 29 ... First comparator, 30 ... Second comparator, 31 ... Set speed switch, 32 ...
... speed controller.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Parkani 2410 Motoe, Uozu City, Toyama Prefecture Inside Sugino Machine Co., Ltd.

Claims (2)

(57) [Claims] 1. A cylinder lid for mounting an outlet of a soft container containing a saline solution to be supplied to a surgical handpiece for injecting a high-pressure fluid, a cylinder for inserting a soft container attached to the cylinder cover, A piston fitted to the cylinder and pressing the bottom surface of the soft container, a feeder connected to the piston for moving the piston, and a motor for driving the feeder; Pressure device. 2. The physiological saline pressurizing device according to claim 1, wherein a pressure detector for detecting a pressure of the physiological saline supplied to the surgical handpiece and a pressure detected by the pressure detector are preset. Comparing the pressure detected by the pressure detector with a target pressurized pressure set to be higher than the first pressure, the first comparing means generating an output when the first pressure is exceeded. A second comparing means for outputting the deviation, and when no output is generated from the first comparing means, the set rotation speed of the motor is kept high,
When the first comparing means generates an output, the set rotational speed of the motor is switched from high speed to low speed, and further, upon receiving the deviation output from the second comparing means, the pressure detected by the pressure detector decreases the target pressurizing pressure. A set speed switching means for switching the set speed of the motor to zero when the speed exceeds the set speed; speed control means for controlling the speed of the motor based on a set speed output from the set speed change means and a deviation output from the second comparing means; And a pressure control device for a physiological saline pressurizing device.