JP2607128B2 - Liquid injection surgery device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid ejecting surgical apparatus for performing incision, excision, washing, and the like by ejecting a pressurized liquid such as physiological saline.

[Related Art] In recent years, a method of using a pressurized liquid jet for a limited site has been studied in order to improve various surgical methods. In the method using this pressurized liquid jet, by adjusting the pressure and injection amount of the liquid to an appropriate range, it is possible to release the surrounding tissue without cutting the cords such as the vascular system In addition, it is possible to remove the liberated tissue from the treatment site together with the ejected liquid. And its application range is wide, incision and cutting using high pressure of about 10MPa, or detachment using low pressure of 1MPa or less, separation of parenchyma and cords in flexible parts,
It can be used for cleaning etc.

FIG. 7 is a circuit diagram showing a configuration of a liquid ejection surgical apparatus for generating a pressurized liquid jet. In the figure, 11 is a high-pressure gas cylinder, 12 is a manual valve attached to the discharge port of the gas cylinder 11, 13 is a pressure regulator, 14 is an inlet solenoid valve provided at the latter stage of the pressure regulator 13, 15 is a flow control valve, and 16 is a flow rate control valve. Regulating valve 15
A pressure vessel receiving gas pressure supply from the pressure vessel, 17 is a pressure gauge that indicates the gas pressure sent to the pressure vessel 16, 18 is a safety valve, 19 is a release gas flow rate adjustment valve, and 20 is for extracting gas sent to the pressure vessel 16. , And constitute a gas pressure supply circuit. Reference numeral 21 denotes an elastic diaphragm container with an outlet stored in the pressure container 16, and the inside thereof is filled with, for example, physiological saline. 22 is a liquid source solenoid valve connected to the liquid outlet of the container 21 by a sterilized high-pressure hose, 23 is connected to the liquid source electromagnetic valve 22 by a flexible tube,
A handpiece that injects the pressurized liquid sent from as a jet stream 24, 25 is a suction pump that sucks together with the liquid the exfoliated material and the like of the surgical site from the double nozzle at the tip of the handpiece 24,
26 is a pressure gauge, 27 is a pressure detector attached to the gas inlet of the pressure vessel 16, and 28 is a control device.

The gas pressure type liquid ejecting surgical apparatus configured as described above generates a high pressure liquid by pressurizing the liquid in the elastic diaphragm container 21 from the surroundings with a gas pressure such as nitrogen gas sent to the pressure container 16. I have. The pressure control when generating the high-pressure liquid is performed by adjusting the gas pressure of the gas cylinder 11 by the adjuster 13.
Is adjusted to a pressure slightly higher than the desired set pressure range, and the control device 28 controls the inlet solenoid valve 14 and the outlet solenoid valve 20 so that the actual pressure of the pressure vessel 16 obtained from the pressure detector 27 falls within the set pressure range. Opening and closing is controlled.

[Problems to be Solved by the Invention] When the high-pressure liquid is generated, the inlet solenoid valve 14, the outlet solenoid valve 20, or the flow regulating valves 15, 19 of the gas pressure supply circuit are used.
When an abnormality occurs, pressure control cannot be performed, and the jet flow 24 is jetted from the handpiece 23 at a pressure different from a predetermined set pressure. In addition, when the abnormal pressure becomes high, damage to the high-pressure hose on the load side, liquid leakage from the liquid source solenoid valve 22, or a defective portion of the seal portion of the handpiece 23, etc. occur, and a large amount of pressure is applied to the surrounding area. As the liquid is scattered, the set pressure may not be maintained.

If the pressure set in this way cannot be maintained,
There has been a fatal problem that it becomes impossible to jet a jet having a minimum necessary jetting force to the operation site, and in some cases, it is impossible to continue the operation.

Further, when liquid leakage occurs, it is necessary for the operator to visually check the liquid source solenoid valve 22 after closing, or to perform a depressurizing operation. There was a problem.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a liquid ejecting surgical apparatus having an abnormality detection function that can automatically determine an abnormality in gas pressure with a simple configuration. Things.

[Means for Solving the Problems] A liquid ejecting apparatus according to the present invention includes a pressure detector for detecting a gas pressure at an inlet of a pressure vessel, a sampling time setting means for setting a plurality of predetermined sampling times, and Sampling time selecting means for selecting a sampling time set by the sampling time setting means; change rate calculating means for calculating a change rate of the gas pressure detected by the pressure detector for each sampling time selected by the sampling time selecting means; A comparison means for comparing the change rate calculated by the change rate calculation means with a preset reference change rate; and an alarm means for issuing an alarm based on an output signal from the comparison means. The task has been achieved.

[Operation] In the present invention, the actual pressure of the gas pressure for pressurizing the liquid in the elastic diaphragm container from the surroundings is measured, and the pressure change rate for each of a plurality of predetermined sampling times is calculated and calculated. By comparing the obtained pressure change rate with the reference change rate, the actual pressure fluctuation state is constantly monitored, and an abnormal gas pressure is automatically detected and an alarm is issued.

Embodiment FIG. 1 is a block diagram of a main part according to an embodiment of the present invention. The configuration of the liquid ejecting apparatus itself is basically the same as that shown in FIG. In FIG. 1, reference numeral 1 denotes a plurality of predetermined sampling times T ₁ , T ₂ , T ₃ , T ₄
2 is a sampling time selection means for selecting the sampling times (time constants) T ₁ , T ₂ , T ₃ , T ₄ set by the sampling time setting device 1. The sampling time selecting means 2 comprises, for example, a plurality of AND circuits 2b of a switching circuit 2a. 3 is the actual pressure Ps of the pressure vessel 16 detected by the pressure detector 27 on the inlet side of the pressure vessel 16 and the selected sampling times T ₁ , T ₂ , sent from the sampling time selection circuit ₂ .
A change rate calculating device for calculating a gas pressure change rate ΔP / T _i (i = 1 to 4) for each sampling time based on one of T ₃ and T ₄ , Change rate {P / T _i and reference change rate set in reference change rate setting device 5}
A comparison circuit 6 for comparing P _o with an alarm is issued by a signal sent from the comparison circuit 4 to issue an alarm and display, and in some cases, stops the liquid ejection from the handpiece 23.

Before explaining the operation of the device configured as described above,
Rate of change of gas pressure in the liquid ejecting apparatus shown in FIG.
The relationship between P / T _i and the cause of the abnormality will be described.

In abnormality cause 1 inlet solenoid valve 14 is open command, when the increase rate △ P / T ₁ of the outlet solenoid valve 20 is close instruction of capital in T ₁ seconds per gas pressure does not reach the reference change rate △ P has an inlet Since the gas pressure in the pressure vessel 16 does not increase even though the solenoid valve 14 is instructed to open, the gas cylinder
Inlet solenoid valve such as 11 gas pressure decreased, inlet solenoid valve 14 did not open, or clogged orifice
It is conceivable that the malfunction of 14, the clogging of the flow control valve 15, or the leakage of the outlet solenoid valve 20, etc.

Abnormal cause 2 When the rate of increase in gas pressure every ₂ seconds T △ P / T ₂ exceeds the reference rate of change △ P when the inlet solenoid valve 14 is closed, check if the valve seal of the inlet solenoid valve 14 is defective. The operation of the inlet solenoid valve 14 is not completed.

Cause 3 When the inlet solenoid valve 14 is closed and the outlet solenoid valve 20 is opened, and the gas pressure drop rate △ P / T ₃ every T ₃ seconds does not reach the reference change rate △ P, It is considered that the valve of the valve 20 does not open, malfunction of the outlet solenoid valve 20 such as clogging of the orifice, clogging of the flow regulating valve 19, or malfunction of the inlet solenoid valve 14.

Abnormal cause 4 If the gas pressure drop rate △ P / T ₄ every T ₄ seconds exceeds the reference change rate △ P when the outlet solenoid valve 20 is closed, malfunction of the outlet solenoid valve 20 or fluid Leakage of the load side circuit has occurred due to breakage of the high pressure hose or the like of the circuit.

The sampling times T ₁ , T ₂ , T ₃ , T ₄ and the reference rate of change ΔP differ depending on the volumes of the gas pressure supply circuit and the load side circuit. The sampling times T ₁ , T ₂ , T ₃ , and T ₄ are specifically set to about 0.1 second to 3 seconds to improve the detection accuracy.

 Thus, the operation of the apparatus shown in FIG. 1 will be described.

The pressure detector 27 constantly detects the pressure Ps of the gas in the pressure vessel 16 and sends it to the change rate calculation device 3. On the other hand, in the sampling time setting device 1, each sampling time T ₁ , T ₂ , T ₃ , T ₄
Generates a time constant signal of the sampling time selection circuit 2
Has given to. The sampling time selection circuit 2 sequentially selects each sampling time T _{1 to} T ₄ in order and sends it to the change rate calculation device 3 and sends the selection signal to the comparison circuit 4. The change rate calculating device 3 calculates the gas pressure sent from the pressure detector 27.
Ps and the sampling time T ₁ , T ₂ , T ₃ , and T ₄ sequentially sent from the sampling time selection circuit 2 change the gas pressure Ps in the rate of change ΔP
/ T _i is calculated and sent to the comparison circuit 4. The comparison circuit 4 compares the transmitted change rate ΔP / T _i with the reference ΔP _o, and determines the presence or absence of an abnormality from the above-mentioned abnormality causes 1 to 4 by a selection signal sequentially transmitted from the sampling time selection circuit 2. to decide.

That a of FIG. 2, b, determines that there is no abnormality cause 1 when the pressure increase rate of T _per second as shown in c △ P / T ₁ is the reference rate of change △ P _o or more, the d As shown, when the pressure rise rate 上昇 P / T ₂ has not reached the reference change rate △ _Po , it is determined that abnormality cause 1 has occurred.

Also, as shown in FIGS. 3a and 3b, the rate of pressure rise every ₂ seconds TTP
/ T ₂ is determined to be normal when the reference rate of change △ is P _o or less, c, as shown in d, abnormality cause 2 when the pressure rise rate △ P / T ₂ exceeds the reference rate of change △ P _o Is determined to have occurred.

As shown in a and b of FIG. 4, the pressure drop rate every T ₃ seconds △ P / T ₃
Is normal when the rate of change is equal to or greater than the reference change rate △ _Po , and c,
As shown in d, when the pressure drop rate い な い P / T ₃ does not reach the reference change rate △ _Po , it is determined that the cause of abnormality 3 has occurred.

Further, a of FIG. 5, when the pressure drop rate of T ₄ seconds each as shown in b △ P / T ₄ is within the reference rate of change △ P _o is determined to be normal, c, as shown in d Pressure drop rate △ P / T ₄ is standard change rate △ P
_If it exceeds _o , it is determined that abnormality cause 4 has occurred.

FIG. 6 shows the pressure fluctuation of the gas circuit detected by the pressure detector 27 when the high-pressure hose of the load-side circuit is actually broken and the pressurized liquid leaks. In FIG. 6, A is the time when the jet stream 24 is started to be injected from the handpiece 23, and B is the time when the high-pressure hose is broken and liquid leakage occurs. As shown in the figure, when the jet stream 24 is being injected, the rate of drop of the gas pressure P is small, but when the liquid leaks, the gas pressure P drops at a large rate, so this drop rate is detected. This makes it possible to detect a liquid leak in the load side circuit.

When the cause of each abnormality is determined by the comparison circuit 4, the result is sent to the alarm device 6 to issue an alarm and to display the cause of the abnormality.

[Effects of the Invention] As described above, the present invention measures the actual pressure of a gas that pressurizes a liquid in an elastic diaphragm container from the surroundings, and determines a plurality of sampling times predetermined according to the cause of the abnormality. By calculating the pressure change rate for each and comparing the calculated pressure change rate with the reference change rate, the abnormality and the cause of the abnormality in the gas pressure supply circuit or the load side circuit are detected. It is possible to automatically detect the abnormality of the injection surgical apparatus, and to enhance the safety of the liquid injection surgical apparatus.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an essential part of an embodiment of the present invention, FIGS. 2 to 5 are explanatory diagrams each showing the operation of the above embodiment, and FIG. FIG. 7 is a circuit configuration diagram showing a basic configuration of the liquid ejection surgical apparatus. 1 ... sampling time setting device, 2 ... sampling time selection circuit, 3 ... change rate calculation device, 4 ... comparison circuit,
5: Reference change rate setting device, 6: Alarm device.

Claims (1)

(57) [Claims] 1. An elastic diaphragm container filled with a liquid is set in a pressure container connected to a gas pressure supply source, a surgical handpiece is connected to a liquid outlet of the elastic diaphragm container, and the elastic diaphragm container is connected to the pressure container. A liquid ejecting surgical device which pressurizes the surroundings by gas pressure in the inside and feeds the liquid from the inside of the elastic diaphragm container to the surgical handpiece, wherein a pressure detector for detecting the gas pressure at the inlet of the pressure container and a predetermined pressure detector Sampling time setting means for setting a plurality of sampling times, sampling time selecting means for selecting the sampling time set by the sampling time setting means, and the pressure detector for each sampling time selected by the sampling time selecting means. Rate-of-change calculating means for calculating the rate of change of the gas pressure detected in step (a), and the rate of change calculated by the rate-of-change calculating means and A liquid ejecting surgical apparatus comprising: a comparison unit that compares the reference change rate; and an alarm unit that issues an alarm based on an output signal from the comparison unit.