JPH0217053A - Pressure control method of liquid jet operation apparatus - Google Patents

Abstract

PURPOSE:To stably obtain a pressurized physiological saline solution of desired pressure by calculating a pressure change ratio until the pressure detected by a pressure detector reaches a preset upper limit pressure and shutting off the supply of the high pressure gas, which is supplied to a pressure container before liquid pressure reaches the upper limit pressure, on the basis of said change ratio. CONSTITUTION:A pressure control valve 5 is opened in starting use, and the pressure in a pressure container 9 and that in a receiving container 8 gradually rise to reach predetermined pressure. The pressure change at this time is monitored and detected by a pressure detector 7 and the detected pressure is operationally processes by a controller 21 to obtain a pressure rising rate RP. A critical value RS is preset with respect to said pressure rising rate to be compared with the pressure rising ratio RP. As a result of comparison, at the time of RP>RS, the offset value RI to a pressure upper value PU is calculated on the basis of a definite calculation standard and a signal is outputted from the controller 21 in order to close the pressure control valve 5 at the point of time when the detected pressure PR reaches (PU-PI), that is, before said pressure PR reaches the pressure upper limit value PU.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to pressurization control of a pressurized liquid generator in a liquid jet surgical device.

[Prior Art] (2) Pressurized containers for storing surgical liquid containers, and in recent years, research has been conducted into methods of using pressurized liquid jets for limited areas in order to improve various surgical methods. The surgical handpiece used in this method is disclosed in, for example, Japanese Patent Publication No. 61-24013, Japanese Utility Model Publication No. 62-13604, Japanese Utility Model Publication No. 62-32009, and Japanese Utility Model Publication No. 62-32009.
It is disclosed in 2010 publication etc. on the other hand.

A device for obtaining a pressurized liquid jet is disclosed, for example, in Japanese Patent Laid-Open No. 63-135153 filed by the applicant of the present application.

In this method using a liquid jet, by adjusting the pressure and injection amount of the liquid within an appropriate range, it is possible to free the surrounding tissue without cutting cords such as the vascular system. Not.

The loose tissue can be removed from the treatment area together with the jetted liquid. The range of application is wide, and it can be used for incision and cutting using high pressure such as 0 MPa, peeling and separation using low pressure such as IMPa or lower, and cleaning.

In this method using a pressurized liquid jet, physiological saline is generally used as the pressurized liquid, and the conventional method of pressurizing this physiological saline is, for example, as shown in FIG. Physiological saline sent from water container +01 is pressurized by plunger pump +02. This pressurized saline is supplied to the switching valve 103, hose +
04 to the handpiece 105, and is ejected toward the surgical site through the nozzle part +06 in the handpiece 105. On the other hand, the liquid in and around the surgical site is removed from the nozzle part 1.
The suction device is connected from the suction port of 06 through the suction hose 107!
108.

Pumps that use this pressurized liquid jet are required to meet various requirements due to the special conditions of surgery, among which are the ability to reliably maintain the sterile state of saline and the ability to maintain the desired pressure depending on the application. It is particularly important that it can be easily obtained and that the pressure can be maintained stably. especially,
The pressure is stable within the specified range. To be held 1. This is extremely important; using more pressure than necessary will damage areas other than the targeted internal organs, and conversely, using less pressure than necessary, the surgery will take longer and place a greater burden on the patient.

A pump device that has the function of reliably maintaining sterility! The applicant has already filed an application. In other words, the contact area of the saline is minimized and the flexible saline container is pressurized from the outside.The pressurizing means is high-pressure gas, high-pressure liquid, or a piston that directly applies pressure. We have proposed various methods. However, such ti′H
of! In i1, it is possible to maintain the sterilization of the parts in contact with the liquid, but in order to stably obtain pressurized saline at a desired pressure, it is necessary to optimize the pressure control.

[Problems to be Solved by the Invention] In view of the above-mentioned conventional problems, the present invention provides a pressurization control method for stabilizing the pressure of pressurized physiological saline.

Means for Solving Problem C] The present invention provides effective pressurization control to solve the above-mentioned problems. , a handpiece that communicates with the storage container via a discharge valve, a high-pressure gas container that communicates with the pressurized container via a throttle valve and a pressurization control valve, and a circuit between the throttle valve and the pressurized container. a controller configured to receive a signal from the pressure detector as an input signal and output a control signal for the discharge valve and the pressurization control valve; The rate of pressure change until the pressure reaches the upper limit is calculated, and based on the rate of change, the supply of high-pressure gas to the pressurized container is cut off before the liquid pressure reaches the upper limit pressure. The high-pressure gas whose supply to the pressurized container was cut off before reaching the high-pressure container is supplied to the pressurized container.

[Example] The present invention will be explained in more detail below based on the illustrated example (I).

FIG. 1 is a hydraulic circuit diagram of a liquid injection surgical device to which the present invention is applied. In the figure, reference numeral 1 denotes a high-pressure gas tank, which is connected to a pressurized container 9 through a gas pipe 91. 2 is a pressure regulator disposed in the gas pipe 91, and 3 is a pressure gauge provided in communication with the gas pipe 91. Reference numeral 4 denotes a needle valve, which is disposed in communication with the gas pipe 91. S tt
Pressurized $I II valve, high pressure gas container 1 and pressurized metal! !
The gas pipe 91 is disposed between the gas pipe 9 and the gas pipe 9. Reference numeral 6 denotes a throttle valve, which is connected to a gas pipe 91 downstream of the pressure control valve 5.
It is located in 7 is a pressure detector and the pressure control valve 5
It is also disposed downstream of the throttle valve 6 so as to communicate with the gas pipe 91 . 8 is a liquid storage container, and generally a physiological saline bag can be used as is. Reference numeral 10 denotes a stop valve provided in the path of the pressurizing pipe 92 that connects the storage container 8 and the handpiece 11.
It is arranged so that communication with the terminal can be cut off. 12 is a collection tank, and 13 is a suction pump.

Now, the gas in the high-pressure gas container 1 is adjusted to a desired pressure at pressure adjustment t12, and then introduced into the pressurized container 9 through the gas pipe 91. A storage container 8 is housed in the pressurized container 9, and high pressure gas acts around the storage container 8. Capacity! ! 8 is crushed by high pressure gas, so the storage capacity! ! The liquid in 8 is pressurized and is injected from hand piece 11 via pressurizing piping 92. Also, handpiece 1
The liquid ejected from the pump 1 is sucked together with other liquids and solids by the bow pump 13, passes through the suction pipe 93, and is collected at the collection point 12.

By the way, depending on the liquid container used in the hand piece 11, liquid is discharged from the storage container 8, and the pressurized container 9 is discharged accordingly.
The handpiece 11 is configured to be supplemented with high-pressure gas so that liquid at a constant pressure is always injected from the handpiece, but it is common for the handpiece 11 to repeatedly inject and stop the liquid. In that case, the supply and stop of the high pressure gas to the pressurization 1189 are performed in conjunction with the injection and stop of the node piece 11. At this time, handpiece 1
Depending on the timing of the injection/stop of the high-pressure gas and the timing of the supply/stop of the high-pressure gas, the pressure of the sling in the pressurizing pipe 92 fluctuates irregularly, causing variations in the surgical effect.

Therefore, by detecting the pressure inside the gas pipe 91 with the pressure detector 7, the high pressure pipe 92 is secondarily detected based on the pressure.
This system detects the pressure inside each pipe and controls the supply of high-pressure gas according to the pressure inside each pipe.

First, at the start of use, the pressurization control valve 5 is opened, and the pressure inside the pressurization container 9 and the storage container 8 gradually increases to reach a predetermined pressure. Pressure detection 11i7 detects the pressure change at this time.
The pressure is monitored and detected by the controller 21, and the detected pressure is processed by the controller 21 to obtain the pressure increase rate RP.

A critical value Rs is set in advance for this pressure increase rate R, and the critical value R5 and the pressure increase rate R are compared. If the comparison result R,>Rs, the pressure upper limit [Pu is calculated by calculating the offset value P1 for the detected pressure P, based on a certain calculation standard, when the detected pressure P reaches (Pu P+), that is, before reaching the pressure upper limit PU. The controller 21 outputs a signal to close the pressure control valve 5 at R1.
If ≦85, the controller 21 outputs a signal to close the pressure control valve 5 when the detected pressure PR crystallizes to a preset offset value P2 and reaches P, -Pu-P2. It is.

That is, the pressure increase rate R is determined based on the pressure detected by the pressure detector 7, and the pressure increase rate R is compared with the critical value Rs to determine whether RP≦R or RP>Rs. This is to change the closing timing of the pressurization control valve 5. Then, the pressure control valve 5 is closed before the pressure reaches the desired upper limit pressure based on the rate of increase in pressure to prevent excess pressure due to overshoot, and the same control is applied to the lower limit pressure. The pressure control valve 5 is opened before the lower limit pressure is reached to prevent an excessive drop in pressure.

[Effects of the Invention] As described in detail above, according to the present invention, a pressurized container housing a surgical liquid storage container, a hand piece communicating with the storage container via a discharge valve, a throttle valve, and a pressurized container are provided. A pressure detector is installed in a circuit between a high-pressure gas container that communicates with the pressurized container via a control valve, the throttle valve and the pressurizing metal H, and the signal of the pressure detector is used as an input signal to discharge the discharge. The valve includes a pressure control valve that outputs a control signal to the pressure control valve, and calculates the rate of pressure change until the pressure detected by the pressure detector reaches a preset upper limit pressure, and calculates the liquid pressure based on the rate of change. The system controls the supply and shutoff of high-pressure gas supplied to the pressurized container before the upper or lower limit pressure is reached, making it possible to maintain pressure stability and ensure the same performance no matter who uses it. 92: Pressurized piping

Claims (2)

[Claims] (1) A pressurized container that houses a surgical liquid container, a handpiece that communicates with the container via a discharge valve, and a high-pressure gas container that communicates with the pressurized container via a throttle valve and a pressure control valve. , a pressure detector disposed in a circuit between the throttle valve and the pressurized container, and a controller that receives a signal from the pressure detector as an input signal and outputs a control signal for the discharge valve and the pressurization control valve. The pressure change rate until the pressure detected by the pressure detector reaches a preset upper limit pressure is calculated, and based on the change rate, high-pressure gas is supplied to the pressurized container before the liquid pressure reaches the upper limit pressure. A method characterized by cutting off the supply of. (2) A pressurized container that houses a surgical liquid container, a hand piece that communicates with the container via a discharge valve, and a high-pressure gas container that communicates with the pressurized container via a throttle valve and a pressure control valve. , a pressure detector disposed in a circuit between the throttle valve and the pressurized container, and a controller that receives a signal from the pressure detector as an input signal and outputs a control signal for the discharge valve and the pressurization control valve. The rate of change in pressure until the pressure detected by the pressure detector reaches the preset upper limit pressure and lower limit pressure is calculated, and based on the rate of change, the liquid pressure is determined before reaching the upper limit pressure and lower limit pressure. A method characterized by controlling the supply and cutoff of high pressure gas supplied to a pressurized container.