JP2001061856A - Mist generating pipe for bipolar electric tweezers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continually discharge a mist of perfusion liquid by reducing the influence of the surface tension of physiological salt water when a trace amount of physiological salt water is dropped. SOLUTION: This mist generating pipe includes a perfusion part 20 through which physiological salt water is fed out and a gas force-feeding part 21 through which a 'gas from an air pump is force-fed. A small diameter pipe 24 is attached to the perfusion part 20 via an adhesive film 23 and the diameter of an opening 24b in the small diameter pipe 24 which opens to the gas force-feeding part 21 is smaller than the inside diameter of the gas force-feeding part 21. At a mist forming part 22, the physiological salt water fed out through the small diameter pipe 24 is mixed with the compressed air from the gas force-feeding part 21 and formed into a mist.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mist generating tube for bipolar electric tweezers used for hemostasis and incision in surgery, mainly neurosurgery.

[0002]

2. Description of the Related Art Conventionally, bipolar electric tweezers used for neurosurgery or the like have a pair of electrode portions inside a front end of a tweezer body that can be opened and closed. A high-frequency generator is electrically connected to the rear end of the tweezers main body, and a high-frequency current is supplied from the high-frequency generator to each electrode unit. The tweezers main body is formed with an insulating film except for the electrode portion. Then, a high-frequency current is applied to the electrode section in a state where the affected part such as a living tissue or a blood vessel is held at the front end of the tweezer body. Then, the affected part is coagulated (hemostatic) by the Joule heat effect, or the affected part is incised by the discharge effect.

However, during coagulation or incision,
Due to the use of high-frequency current, the affected area generates heat. Therefore, heat is transmitted to the affected part and its peripheral part.
Therefore, in order to solve such a problem, the present applicant arranges a perfusion tube inside the tweezers main body, and uses a physiological saline solution as a perfusate and a gas (gas) such as carbon dioxide gas to remove the affected part. A method of cooling is proposed. That is, carbon dioxide gas is delivered from a carbon dioxide gas cylinder, and physiological saline is pumped by a rotary pump or the like. Then, a gas pressure feed pipe through which carbon dioxide gas flows is connected to a perfusion pipe through which physiological saline flows through a Y-shaped pipe. According to such bipolar electric tweezers, physiological saline and carbon dioxide gas are mixed in the junction passage of the Y-shaped tube, and further mist is formed by gas pressure.
At the time of coagulation or incision of the affected part, physiological saline is sprayed in a mist form through a discharge port of a perfusion tube provided in the tweezer body. Therefore, the influence of heat on the tissue around the affected part can be minimized.

[0004]

By the way, when the saline is to be sprayed in a mist form to the affected part as described above, the junction of the saline and the compressed air in the Y-shaped tube is required.
That is, at the opening in the Y-shaped tube through which the physiological saline flows out, the physiological saline becomes spherical due to surface tension. And
When the amount of delivered physiological saline is very small, the physiological saline is not blown toward the tweezers main body by gas pressure, and only carbon dioxide is discharged to the affected part. Then, after the lapse of time and the ball of the saline becomes larger, the saline is blown off by the gas pressure. There is a problem that the saline is intermittently discharged from the discharge port of the perfusion tube.

An object of the present invention is to provide a mist for bipolar electric tweezers capable of suppressing the influence of the surface tension of physiological saline when a small amount of physiological saline is dropped, and capable of continuously discharging a mist-like perfusate. To provide a generator tube.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a perfusion solution passage for sending out a perfusion solution, and a gas pressure delivery passage for delivering gas from a gas source. A mist generating pipe for irrigating the perfusate delivered from the perfusion fluid passage with gas from the gas pressure delivery passage, wherein an opening diameter of the perfusion fluid passage opening in the gas pressure delivery passage is defined as a gas pressure delivery passage. The gist of the present invention is that it is smaller than the inner diameter of.

According to a second aspect of the present invention, in the mist generating tube for bipolar electric tweezers according to the first aspect, the opening of the perfusate passage is arranged on the central axis of the gas pressure passage. I do.

According to a third aspect of the present invention, there is provided a perfusion solution passage for sending out a perfusion solution, and a gas pressure delivery passage for delivering gas from a gas source. A mist generating tube that is turned into mist by gas pumped from a gas pressure feeding passage, wherein a throttle is provided in the gas pressure feeding passage, and the perfusion liquid passage is opened in the throttle forming portion or near the downstream side of the throttle. That is the gist.

According to the first aspect of the present invention, since the opening diameter of the downstream side of the perfusion liquid passage is smaller than the inner diameter of the gas pressure supply passage, even if a small amount of physiological saline is dripped, the perfusion is performed. The sphere formed by the physiological saline formed in the opening of the liquid passage quickly grows larger, is blown off by the gas fed, and is continuously discharged in the form of a mist.

According to the second aspect of the present invention, in addition to the function of the first aspect, since the velocity of the gas is the fastest in the central axis of the gas pressure feeding passage, the sphere made of saline formed in the opening can be easily blown. It is.

According to the third aspect of the present invention, even when a very small amount of physiological saline is dropped, the velocity of the gas passing through the throttle is further increased. The ball of saline is blown off by the gas having increased speed, and the physiological saline is continuously discharged in the form of a mist.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a schematic diagram showing the entire device of the bipolar electric tweezers. A perfusion tube 12 is connected to a container 11 containing a physiological saline as a perfusion solution. A part of the perfusion tube 12 is mounted on a rotary pump 13.

An air pump 14 is disposed near the rotary pump 13 as a gas source. The air pump 1
A gas pressure feed pipe 15 is connected to 4, and a downstream end thereof is connected to the perfusion pipe 12 via a Y-shaped pipe 16 as a mist generating pipe provided in the middle of the perfusion pipe 12. That is, the perfusion pipe 12 is connected to one branch pipe of the Y-tube 16, and the gas pressure feed pipe 15 is connected to the other branch pipe of the Y-tube 16.
Is connected. Further, on the downstream side of the Y-shaped pipe 16, the gas pressure pipe 15 is shared with the perfusion pipe 12, and the discharge port of the perfusion pipe 12 (not shown) doubles as the outlet of the gas pressure pipe 15.

The downstream end of the perfusion tube 12 is disposed on bipolar electric tweezers 17. That is, the bipolar electric tweezers 17 are formed in a forked shape, the front end of which can be opened and closed, and the discharge port of the perfusion tube 12 is arranged on the inner surface of one front end. A pair of electrode portions (not shown) are formed on the inner surface of the front end of the bipolar electric tweezers 17 so as to face each other. A high-frequency generator 19 is electrically connected to a connecting portion 18 formed at the rear end of the bipolar electric tweezers 17. Then, a high-frequency current from the high-frequency generator 19 is supplied to each electrode unit.

As shown in FIG. 2, the Y-tube 16 is formed of a synthetic resin, and has a perfusion section 20 as a perfusion liquid passage through which physiological saline is delivered, and a gas pressure passage through which compressed air is delivered. It is composed of a gas pressure feeding section 21 and a mist forming section 22 in which compressed air and physiological saline are mixed. The perfusion unit 20 and the gas pressure sending unit 21 are connected to the mist forming unit 22, respectively, and are formed in a Y-shape. The perfusion unit 20 and the gas pumping unit 21 are formed to have the same diameter along their respective length directions.
Numeral 2 is formed in a tapered shape whose diameter decreases from the upstream side to the downstream side.

A small-diameter tube 24 made of metal and having a diameter smaller than the inner diameter of the perfusion tube 12 is fixed to the perfusion unit 20 via an adhesive film 23. The downstream end portion 24a of the small-diameter tube 24 is formed in a tapered shape whose diameter decreases from the upstream side to the downstream side. The inner diameter of the small diameter pipe 24 and the opening diameter on the downstream side are formed to be smaller than the inner diameter of the gas pumping section 21. An opening 24b on the downstream side of the small-diameter tube 24 is disposed so as to protrude from an opening of the perfusion unit 20 so as to be disposed substantially on the center axis m of the gas pressure sending unit 21.

Next, the operation of the present embodiment will be described. First,
When the rotary pump 13 is driven to rotate, the physiological saline is supplied from the container 11 to the perfusion tube 12 and the rotary pump 13.
Small diameter tube 2 fixed to the perfusion section 20 of the Y-shaped tube 16 through
4 to be pumped. Also, compressed air is sent from the air pump 14 to the gas pumping section 21 of the Y-tube 16 via the gas pumping pipe 15. Then, the physiological saline flowing out to the opening 24b of the small diameter pipe 24 is blown off by the compressed air, so that the physiological saline is mixed with the compressed air in the mist forming part 22. As a result, the physiological saline becomes a mist and is blown out from the discharge port of the perfusion tube 12 in the bipolar electric tweezers 17.

When the physiological saline flows through the small-diameter tube 24 of the Y-shaped tube 16, the opening 24b of the small-diameter tube 24
A ball of physiological saline is formed by the surface tension of the opening 24b. Then, the amount of the physiological saline delivered by the rotary pump 13 is adjusted, and when a small amount of the physiological saline flows through the small-diameter tube 24 of the Y-shaped tube 16, the influence of the surface tension on the physiological saline in the opening 24b increases, The physiological saline is not blown off by the compressed air, and the physiological saline discharged from the discharge port of the perfusion tube 12 is likely to be intermittently discharged.

However, the inside diameter of the small-diameter tube 24 is smaller than the inside diameter of the gas pumping section 21 and the inside diameter of the perfusion section 20, and the distal end portion 24a is tapered to a smaller diameter. Therefore, unlike the case where the small-diameter tube 24 is not used, even if a small amount of physiological saline is delivered, the sphere of the saline formed in the opening 24b of the small-diameter tube 24 immediately becomes large, and the compressed air can be easily compressed. Blown away by.
Therefore, intermittent discharge of the mist-like physiological saline from the discharge port of the perfusion tube 12 is suppressed. Further, since the distal end portion 24a of the small-diameter tube 24 is disposed substantially on the center axis m of the gas pressure feeding section 21 where the gas velocity of the compressed air is the highest,
The influence of the surface tension on the opening 24b of the small-diameter tube 24 is further suppressed.

Actually, a small-diameter tube 24 having an outer diameter of 0.6 mm was attached to the perfusion unit 20 in which the outer diameter of the gas pumping unit 21 and the perfusion unit 20 of the Y-shaped tube 16 was 2 mm. When the delivery rate of the compressed air is set in the range of 30 to 80 ml / s and the delivery rate of the physiological saline is set in the range of 0.01 to 0.03 ml / s, the delivery rate of the physiological saline is set. Although the amount was small, the mist-like physiological saline was continuously discharged from the discharge port without intermittent discharge. As a result, it is considered that the influence of the surface tension of the opening 24b of the small-diameter tube 24 is particularly suppressed when the setting is made in this way, even though the amount of the physiological saline discharged is very small.

According to the above embodiment, the following features can be obtained. (1) In the above embodiment, since the small-diameter tube 24 is attached to the perfusion section 20 of the Y-tube 16, unlike the case where the small-diameter tube 24 is not used, even if a small amount of physiological saline is sent out, The water ball grows up quickly and is easily blown off by the compressed air. Therefore, the influence of surface tension on the physiological saline can be suppressed, and the mist-like physiological saline can be continuously discharged from the discharge port of the perfusion tube 12.

(2) In the above embodiment, the gas pressure feeding unit 21
The opening 24b of the small-diameter tube 24 is arranged substantially on the center axis m of the perfusion unit 20 at the position where the gas velocity is the highest.
Of the opening 24b, and the influence of surface tension can be further suppressed.

(3) In the above embodiment, the adhesive film 23 is interposed on the inner peripheral surface of the perfusion unit 20 and the small-diameter tube 24 is fixed. Therefore, by changing the thickness of the adhesive film 23, a desired small-diameter can be obtained. Tube 24 can be selected and mounted.

(Second Embodiment) Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the following embodiments, configurations that are the same as or correspond to the configurations of the embodiments are given the same reference numerals, and descriptions thereof are omitted.

In the present embodiment, as shown in FIG. 3, a choke 25 as a throttle is formed on the inner peripheral surface of the Y-shaped pipe 16 formed of a synthetic resin and connected to the mist forming part 22 from the gas pressure feeding part 21. ing. The perfusion part 20 of the Y-shaped tube 16 is formed such that its opening 24b is arranged at the middle in the length direction of the choke 25. A small-diameter metal tube 24 having the same diameter in the length direction is fixed to the inside of the perfusion unit 20 via an adhesive film 23.
The small-diameter tube 24 has an opening 24b having a choke 2
5 are arranged along the peripheral surface.

Next, the operation of the present embodiment will be described. A saline solution is supplied from the container 11 to the perfusion tube 12 and the rotary pump 1.
3 and is delivered to the small diameter tube 24 fixed to the perfusion section 20 of the Y-shaped tube 16. Further, compressed air is pressure-fed from the air pump 14 to the choke 25 via the gas pressure feeding pipe 15 and the gas pressure feeding section 21 of the Y-shaped pipe 16. The physiological saline flowing out to the opening 24b of the small-diameter tube 24 is blown off by the compressed air, so that the physiological saline is removed from the mist forming part 22.
Is mixed with the compressed air, and becomes mist-like, and is discharged from the discharge port of the bipolar electric tweezers 17 of the perfusion tube 12.

Here, even if a small amount of physiological saline flows through the small-diameter tube 24 of the Y-shaped tube 16 and a saline ball is formed due to the surface tension of the opening 24b of the small-diameter tube 24, the inside of the choke 25 remains. The flowing compressed air is faster than the velocity flowing through the gas pressure pipe 15 and the gas pressure section 21. Therefore, the influence of the surface tension of the saline at the opening 24b of the small diameter tube 24 is suppressed, and the saline is continuously discharged from the discharge port of the perfusion tube 12.

Therefore, according to the present embodiment, in addition to the features described in (1) and (3) in the first embodiment, the mist forming section 22 and the gas pressure feeding section 21 of the Y-tube 16 are provided.
The choke 25 is provided on the inner peripheral surface continuous with the gasket 25, and the compressed air flowing through the choke 25 is faster than the gas flowing through the gas pumping tube 15 and the gas pumping unit 21. Can be suppressed.

The present embodiment may be modified as follows. (A) In the second embodiment, the perfusion unit 20 is formed so that the opening 24b is located at the middle in the length direction of the chalk 25. However, as shown in FIG. 25 may be provided at a location near the downstream port where the speed of the compressed air hardly decreases. In FIG. 4, the small-diameter tube 24 has a tip portion 24 a having a
Is mounted such that the opening 24b of the tip 24a is disposed substantially on the center axis n of the choke 25. For this reason, the tip 24
The opening 24b of a is located at the position where the gas velocity is the fastest. The distal end 24a of the small-diameter tube 24 is formed in a tapered shape whose diameter decreases from the upstream side to the downstream side.

(B) In the first embodiment and another embodiment described in (a), the distal end portion 24a of the small-diameter tube 24 is formed in a tapered shape whose diameter decreases from the upstream side to the downstream side. In the second embodiment, the small-diameter tube 24 is formed to have the same diameter in the length direction.
a may be formed into either a tapered shape or an equal diameter.

(C) In another embodiment described in the above (a), the choke 25 is provided at the portion where the compressed air flows, but an orifice may be provided instead. (D) In the first and second embodiments, the Y-shaped tube 16 is formed of a synthetic resin, but may be formed of a metal.

(E) In the first and second embodiments, the small-diameter tube 24 is made of metal, but may be made of synthetic resin. (F) In the first and second embodiments, the flow path of the physiological saline is reduced using the small-diameter tube 24. However, the perfusion unit 20 is reduced in advance without using the small-diameter tube 24. Y-tube 1
6 may be molded.

(G) In the first and second embodiments, the adhesive film 23 is interposed between the perfusion section 20 and the small-diameter tube 24. However, the adhesive film 23 is not interposed and the perfusion section 20 is reduced in diameter. It may be formed and the small-diameter pipe 24 may be press-fitted. In addition, the perfusion unit 20
May be press-fitted using a tube in which the outer diameter of the small-diameter tube 24 is larger than the inner diameter of the perfusion unit 20.

(H) In the second embodiment, the small-diameter pipe 24
The opening 24b is mounted along the peripheral surface of the choke 25, but may be mounted so as to protrude beyond the peripheral surface of the choke 25.

(I) In the first embodiment and the other embodiment described in (A), the opening 24b of the small-diameter tube 24 is disposed so as to protrude from the opening of the perfusion section 20, but the opening is not limited. The small-diameter pipe 24 may be arranged so that the portion 24b is along the peripheral surface of the gas pressure feeding unit 21 or the mist forming unit 22.

(N) In the first and second embodiments, compressed air is supplied as a gas from a gas source using an air pump. However, the compressed air is supplied using a gas cylinder or a gas source installed in a hospital in advance. The gas may be pumped.

(L) In the first and second embodiments, physiological saline is used as the perfusion liquid, but other liquids may be used. (ヲ) In the first and second embodiments, the perfusion section 20, the gas pressure feeding section 21, and the mist forming section 22 are formed to be Y-shaped, but may be formed to be T-shaped.

[0039]

As described above in detail, according to the first aspect of the present invention, it is possible to suppress the influence of the surface tension of the physiological saline at the time of dropping a small amount of the physiological saline, and to obtain a mist-like perfusion. The liquid can be continuously discharged.

According to the second aspect of the invention, in addition to the effect of the first aspect, since the velocity of the gas is the fastest in the central axis of the gas pressure feeding passage, the influence of the surface tension of the physiological saline can be further suppressed. Can be.

According to the third aspect of the present invention, even when a small amount of physiological saline is dripped, the velocity of the gas passing through the throttle is further increased, so that the physiological saline formed at the opening of the perfusate passage is formed. The sphere is blown off by the gas with the increased speed, and can continuously discharge the mist-like physiological saline.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the entire device of bipolar electric tweezers.

FIG. 2 is a cross-sectional view of a mist generating tube according to the first embodiment.

FIG. 3 is a sectional view of a mist generating tube according to a second embodiment.

FIG. 4 is a cross-sectional view of a mist generating tube according to another embodiment.

[Explanation of symbols]

14 ... air pump (gas source), 17 ... Y-shaped pipe (mist generating pipe), 20 ... perfusion part (perfusion liquid passage), 21 ... gas pressure feed part (gas pressure feed path), 24b ... opening, 25 ... chalk (throttle) ).

Claims (3)

[Claims] 1. A perfusion solution passage for delivering a perfusion solution, and a gas pressure delivery passage for pumping a gas from a gas source, wherein the perfusion solution delivered from the perfusion solution passage is supplied with gas from the gas pressure delivery passage. 2. A mist generating tube for bipolar electric tweezers, wherein a diameter of an opening of the irrigating liquid passage opening into the gas pressure feeding passage is smaller than an inner diameter of the gas pressure feeding passage. 2. The mist generating tube for bipolar electric tweezers according to claim 1, wherein the opening of the perfusate passage is arranged on the central axis of the gas pressure feed passage. 3. A perfusion solution passage for sending out a perfusion solution, and a gas pressure delivery passage for delivering gas from a gas source, wherein the perfusion solution delivered from the perfusion solution passage is pumped from the gas pressure delivery passage. A mist generating tube which is turned into mist by gas, wherein a throttle is provided in the gas pressure feeding passage, and the perfusion liquid passage is opened in the throttle forming portion or near the downstream side of the throttle. Mist generating tube for tweezers.