KR20160000231A - Tip and handpiece for ocular surgery, ocular surgery system using thereof - Google Patents

Abstract

The present invention relates to an intraocular surgery tip, an intraocular surgery handpiece, and an intraocular surgery system using the same. The intraocular surgery tip irrigates a flushing medium to an intraocular affected area at a particular level of pressure, and is used for an intraocular surgery, including a cataract surgery, which aspirates an affected area tissue needed to be removed through an aspirating path. To this end, the intraocular surgery tip comprises: a flushing pipe having one end connected to a flushing medium accommodating unit for accommodating a flushing medium, having the other end equipped with a spraying unit for spraying the flushing medium, and providing a particular level of positive pressure into an eyeball through the flushing medium supplied from the flushing medium accommodating unit; and an aspirating pipe formed to surround the flushing pipe, having one end connected to a vacuum pump, having the other end equipped with an aspirating hole, and aspirating a biological tissue in an eyeball through the aspirating hole to the outside of the eyeball. The flushing pipe and the aspirating pipe are inserted in an eyeball, and a biological tissue separated from a vesica by a particular level of positive pressure of the flushing medium provided from the flushing pipe is aspirated by the aspirating pipe. Accordingly, a conventional inconvenient method used for removing fine cortex residues is excluded, and a surgery time may be reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to an intraocular surgical tip, an intraocular surgical handpiece, and an intraocular surgery system using the same. BACKGROUND ART [0002]

The present invention relates to a surgical tip for intraocular (intraocular) surgery, a handpiece for intraocular surgery, and an intraocular surgery system using the same. More particularly, the present invention relates to an intraocular intraocular surgery system using irrigation, A surgical tip for intraocular surgery, a handpiece for intraocular surgery, and an intraocular surgery system using the intraocular surgery tip, which are used for intraocular surgery such as cataract surgery, in which an affected part tissue requiring removal is aspirated through an aspiration path.

1 (a), 2 (b), 2 (c) and 2 (d), the lens 2 is divided into an intraocular lens, i.e., an intraocular lens (IOL) There are many surgeries to exchange with. In the case of cataracts, ophthalmic surgeons cut the cornea 6 or the periphery of the cornea in a small size, insert a handpiece having a tip to remove the opacifying lens 2, 8) is inserted and fixed at a position where it is fixed permanently.

These cataract surgeries include PEA (phacoemulsification and aspiration), extracapsular cataract extraction, and intracapsular cataract extraction. Ultrasonic emulsion suction is widely used. FIGS. 3 and 4 are schematic and sectional views of a conventional handpiece for intraocular surgery. The intraocular surgical handpiece 200 used in the ultrasonic emulsification and aspiration procedure includes an intraocular surgical tip 100 at the tip thereof And one side thereof is connected to the fluid-receiving unit 220 and the vacuum pump 230. In the intraocular surgical tip 100, a suction tube 110 is centered and a double-tube type perfusion tube 150 is configured to surround the suction tube 110. The suction tube 110 is provided at its tip with a suction port 130 through which the nucleus 3 or the cortex 4 is sucked and the sucked nucleus 3 or the mass of the cortex 4 flows along the suction path 120, Respectively. One end of the perfusion pipe 150 is provided with a perfusion port 160 through which the perfused liquid is discharged and a perfusion passage 140 through which the perfused liquid provided in the perfusion liquid storage unit 220 passes.

The process of removing the lens in the ultrasound emulsion aspiration can be roughly divided into two processes.

The first process is the ultrasonic destruction and emulsification of the nucleus (3) of the lens (2). The nucleus (3) is crushed and emulsified by the ultrasonic vibration while the infusion liquid is introduced into the eye using the ultrasonic handpiece which generates the ultrasonic vibration. The nucleus 3 of the emulsified lens is sucked through the suction path 120 formed on the handpiece together with the perfusion liquid and discharged to the outside of the eyeball. At this time, inflow volume, inflow pressure, aspiration volume and suction pressure of infusion fluid remain the same, so intraocular pressure is kept constant and stable.

The second process is the removal of the cortex of the lens (4, cortex). Figure 5 shows a photograph of an actual operation for removing the cortex 4. [ As shown in FIG. 5, the cortical body 4 is removed using an intraocular surgical handpiece 200 having an I & A irrigation and aspiration function without ultrasonic vibration. The cortex 4 is sucked through the suction path 120 formed in the intraocular surgical handpiece 200 together with the perfusion liquid, and discharged to the outside of the eyeball. At this time, the inflow volume and suction volume of the perfusion fluid remain the same, and the inflow pressure and the suction pressure are kept the same, so that the intraocular pressure remains constant and stable.

Patent Document 1: Japanese Patent Application Laid-Open No. 10-2005-0019769 Patent Document 1: JP-A-10-2013-0139319

However, when an eye surgery such as cataract is actually performed, there is a cortex (4) which is not easy to be removed only by the in-eye surgical handpiece (200) having the perfusion suction function. FIG. 6 shows a photograph of an actual operation showing cortical remnants. In general, the size of the cortex 4 is larger than that of the front end due to the suction of the tip provided on the handpiece 200, so that removal is easy. However, as shown in FIG. 6, in many cases, a very fine cortical remnant 4a like a thread remains attached to the capsule 5. In this case, a function of removing the fine cortical remnants 4a as a polishing mode included in the recent intraocular surgical handpiece 200 can be used. However, such a function is constituted such that the sound pressure of the surgical handpiece in the eye is weakly operated, and it is considerably difficult to effectively remove the cortical residue 4a or the invisible cortical remnant 4a which is ambiguous in size.

When the size of the cortical remnants 4a is smaller than the diameter of the in-eye surgical tip 100 provided in the intraocular surgical handpiece 200, a high sound pressure is not applied. If the cortical remnants 4a are to be removed by the intraocular surgical tip 100 for a while, the nail 5 is often stuck to the tip of the tip, and the nail 5, which receives a strong negative pressure, is torn . During ocular surgery, the nasal cavity (5) must remain intact, especially the posterior capsule should never be damaged.

Ultimately, the polishing mode is very inconvenient to the ophthalmologist who performs intraocular surgery, and requires high concentration of attention to avoid damage to the posterior capsule, which increases the operation time and increases the possibility of side effects. Particularly, since the posterior capsule is likely to be damaged in the process of removing the cortical remnants (4a), it may become a problem in the subsequent improvement of the visual acuity.

Accordingly, the present invention has been made to solve the above-described problems.

It is an object of the present invention to provide an intraocular surgery that is used for intraocular surgery such as cataracts in which a perfusion liquid is irrigation at a specific pressure while irrigation is performed, And an intraocular surgery system using the same.

Hereinafter, specific means for achieving the object of the present invention will be described.

An object of the present invention is to provide an infusion pump which has a first end connected to a perfusion liquid containing portion for containing a perfusion liquid and a second end provided with an injection port for injecting the perfusion liquid, ; And a suction tube which is configured to surround the perfusion tube and has one end connected to a vacuum pump and the other end having a suction port and sucking the biotissue in the eyeball outward through the suction port, Wherein the tube and the suction tube are inserted into the eyeball and the living tissue separated from the bag by the specific positive pressure of the perfusion liquid provided in the perfusion tube is sucked by the suction tube. .

In addition, the perfusion tube may protrude from the end of the suction tube by a specific length. When the perfusion tube is configured to protrude more than the suction tube, the injection port can be positioned at the distal end of the surgical tip in the eye, so that the aiming of the perfusion liquid with the positive pressure on the cortical residue is facilitated.

The specific positive pressure may be 50 to 150 mmHg. Exceeding 150 mmHg may cause damage to the posterior capsule. If it is less than 50 mmHg, there is a possibility that the removal effect of the cortical residue is not significant.

Further, the jetting port may be configured as a multi-port having a plurality of nozzles. When the nozzle has a plurality of nozzles, it is possible to remove cortical residues in a wide range.

In addition, at least one suction port may be provided at the distal end of the suction pipe. According to an embodiment of the present invention, a plurality of suction ports are provided, so that the intraocular pressure can be adjusted throughout the eye.

It is an object of the present invention to provide an intraocular surgical tip according to an embodiment of the present invention; And a handle having a hollow columnar shape and having one side inserted with a surgical tip in the eye, and the surgical tip in the eye can be mounted on and dismounted from the handle. Gt; a < / RTI > intraocular surgical handpiece.

It is an object of the present invention to provide an intraocular surgical tip according to an embodiment of the present invention; A handle having a hollow columnar shape and having one side inserted with the intraocular surgical tip inserted therein; A vacuum pump for providing a suction pressure to a suction tube which is a constituent of the intraocular surgical tip; And a perfusion liquid receiving part for providing a perfusion liquid of a specific positive pressure to the perfusion tube, which is a constituent of the intraocular surgical tip, wherein the in-eye surgical tip is configured to be mountable and dismountable on the handle The present invention also provides an intraocular intraocular surgery system,

The perfusion liquid receiving portion may further include pumping means for generating the specific positive pressure of the perfusion liquid and pressure adjusting means configured to adjust the specific positive pressure.

The specific positive pressure may be 50 to 150 mmHg.

In addition, the perfusion tube may protrude from the end of the suction tube by a specific length.

As described above, the present invention has the following effects.

First, according to the embodiment of the present invention, it is possible to eliminate the use of the polishing mode, which is likely to damage the posterior capsule used to remove minute cortical remnants, and shorten the operation time.

Second, according to the embodiment of the present invention, since the removal of the cortex is more effectively performed, the operation time is remarkably shortened and the degree of visual acuity improved after surgery is improved.

Third, according to one embodiment of the present invention, the intraocular pressure can be maintained constant even during removal of fine cortical remnants.

Fourth, according to the embodiment of the present invention, since the cortical remnant can be operated without replacing the surgical instrument, a remarkable effect of shortening the operation time, reducing the side effects of surgery, and reducing the incidence of medical accidents can be generated.

Fifth, according to the embodiment of the present invention, it is possible to easily remove cortical remnants far from the incision of the cornea.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and, together with the description, And shall not be interpreted.
1 is a sectional view showing the structure of an eyeball,
Figures 2a, b, c, and d are flow charts illustrating the sequence of cataract surgery,
3 is a schematic view showing a surgical tip for intraocular surgery for aspirating the cortex,
Fig. 4 is a sectional view showing an intraocular surgical tip for aspirating the cortex, Fig.
FIG. 5 is a photograph of an actual intraocular surgery showing a process of aspirating a cortex,
FIG. 6 is a photograph of an actual intraocular surgery showing a process of removing cortical remnants,
FIG. 7 is a cross-sectional view showing a surgical tip in the eye according to the first embodiment of the present invention,
8 is a cross-sectional view of a surgical tip in the eye according to the second embodiment of the present invention,
FIG. 9 is a sectional view showing a surgical tip in the eye according to the third embodiment of the present invention, FIG.
10 is a schematic view of a surgical tip for an eyeball according to a modification of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following detailed description of the operation principle of the preferred embodiment of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

Intraocular  Surgical Tips

In connection with the intra-ocular surgical tip, the intra-ocular surgical tip according to an embodiment of the present invention performs irrigation and aspiration functions as in the conventional ocular surgery tip, pressure type perfusion function and aspiration function are improved so that a positive pressure type perfusion function and a suction function are constituted.

The conventional suction tip of the intraocular eye of the negative pressure type was configured to have a maximum suction pressure in the range of 600 mmHg to 750 mmHg and to select the sucking amount within the range of 5 to 100 cc / min. The amount of perfusion of the conventional intraocular intraocular surgical tip was configured to be the same as the above suction amount and the perfusion pressure was configured to be slightly higher than the intraocular pressure (normal intraocular pressure was 10 to 21 mmHg).

The tip of the intraocular surgery according to an embodiment of the present invention is configured to be higher than the perfusion pressure of the conventional intraocular eye surgery tip of the negative pressure type, and is configured to be capable of high pressure injection of the perfusion liquid. That is, according to the embodiment of the present invention, the intraocular surgery tip adopts the positive pressure method unlike the conventional one.

Hereinafter, a specific embodiment of an intraocular surgical tip according to an embodiment of the present invention will be discussed.

FIG. 7 is a cross-sectional view illustrating an intraocular surgical tip according to the first embodiment of the present invention, in connection with the intraocular surgical tip according to the first embodiment. 7, the intraocular surgical tip according to the first embodiment of the present invention differs from the conventional intraocular surgical tip in that the tip of the intraocular surgical tip 10 is provided with the injection port 16 of the perfusion liquid, And a suction port 13 on the side of the intraocular surgical tip 10, as shown in FIG. The injection port 16 may be formed in the form of a nozzle so as to inject the perfusion liquid at a high pressure.

The perfusion tube 15 may include a perfusion passage 14 and a jetting port 16. The perfusion passage 14 is a path through which the perfusion solution passes. The perfusion tube 15 connects the perfusion liquid storage part 220 and the injection port 16 and provides the perfusion liquid to the injection port 16 at a specific pressure.

The perfusion tube 15 may be configured to share a central axis with the intraocular surgical tip 10 and constitute the center of the intraocular surgical tip 10. When the perfusion tube 15 is configured to be coaxial with the intra-ocular surgical tip 10, it is easy for the user to predict the position at which the perfusion liquid is injected at high pressure.

The perfusion tube 15 is connected to the perfusion liquid storage part 220 to receive the perfusion liquid. A conventional regulating device or a pump means for a perfusion liquid is not required in the conventional perfusion solution accommodating part 220. However, in the perfusion solution accommodating part 220 according to an embodiment of the present invention, an electric pump such as an inverter, a hydraulic pump So that the user can adjust the supply pressure of the perfusion liquid. Conventionally, the condition was satisfied if the supply pressure of the perfusion liquid was equal to or greater than the intraocular pressure, and this pressure could be provided only by the potential energy by gravity without a separate pump means. In the perfusion tube 15 according to the embodiment of the present invention, high-pressure injection of the perfusion liquid must be possible, so that a separate pump means is preferably required.

The jetting port 16 may be configured in the form of a nozzle to increase the jetting speed of the perfusion liquid. As the injection speed of the perfusion liquid is increased, the effect of facilitating the removal of the cortical remnants 4a occurs. According to an embodiment of the present invention, a plurality of jetting openings 16 through which a perfusion liquid is radially sprayed can be formed. When the plurality of injection ports 16 are formed, the pressure of the perfusion liquid injected from each of the injection ports 16 is lowered. Therefore, it is necessary to supply the perfusion liquid with a higher perfusion pressure in the perfusion liquid storage part 220. According to an embodiment of the present invention, it is preferable that the injection pressure, which is the pressure of the perfusion liquid injected from the injection port 16, is 50 to 150 mmHg. If the injection pressure is less than 50 mmHg, the cortical remnant is still not removed, and if the injection pressure is more than 150 mmHg, the bag may be damaged.

The suction pipe 11 may include a suction path 12 and a suction port 13. The suction tube 11 is configured such that objects such as the nucleus 3 and the cortex 4 are sucked by the vacuum pump 230 and discharged to the outside of the eyeball. The suction pipe 11 may be configured to surround the perfusion pipe 15 in the form of a double pipe. The aspiration tube 11 is connected to the vacuum pump 230 and has a suction pressure / suction amount that is the same as the perfusion pressure / perfusion amount of the perfusion liquid that is flown into the eyeball in the perfusion tube 15, And the like. Problems may occur in the eye if the amount or pressure of the perfusion liquid that is perfused through the perfusion tube 15 into the eyeball is not equal to the amount or pressure sucked out of the eyeball by the suction tube 11.

The suction port 13 is a hole for sucking the crushed cortical piece 4 by the high-pressure sprayed perfusion liquid. The position of the suction port 13 may be provided on the side or tip of the suction pipe 11. [ Since the conventional suction port 130 is provided at the most distal end of the intraocular surgical tip 10, when the user makes a mistake, the bladder 5 instantaneously (about 0.2 second or less) 5) could be accidentally generated. However, since the suction port 13 according to the embodiment of the present invention is provided on the side surface other than the best end of the intraocular surgical tip 10, Is generated.

8 is a cross-sectional view showing an intraocular surgical tip according to a second embodiment of the present invention, in connection with the intraocular surgical tip according to the second embodiment. As shown in FIG. 8, the intraocular surgical tip 10 according to the second embodiment may form a plurality of injection openings 16 through which a perfusion liquid is radially injected. According to the second embodiment, the range in which the cortex 4 is removed is widened and the removal speed is further improved.

9 is a cross-sectional view illustrating an intraocular surgical tip according to a third embodiment of the present invention, in connection with the intraocular surgical tip according to the third embodiment. As shown in FIG. 9, the intraocular surgical tip 10 according to the third embodiment may be provided at the tip of the suction tube 11 with the position of the suction port 13. When the position of the suction port 13 is provided at the distal end of the suction tube 11, the suction direction and the axial direction of the intraocular surgical handpiece 200 are the same so that the user can easily suck the cortex 4 There is an advantage to be able to do.

FIG. 10 is a schematic view of a surgical tip in the eye according to a modification of the present invention, in connection with the intra-ocular surgery tip according to the modification example. As shown in FIG. 10, the intraocular surgical tip 10 can be provided in various forms, and the user can select an appropriate intraocular surgical tip according to the surgical case to provide an optimal medical service.

Fig. 10A shows a general straight tip shape, Fig. 10B shows a curved tip shape, Fig. 10C shows a 45 DEG tip shape, Fig. 10D shows a 90 DEG tip And FIG. 10E shows a 150 DEG tip shape. In Fig. 10, the arrow indicates the direction in which the perfusion liquid is injected at high pressure and the direction in which the perfusion liquid is sucked.

Although the description has been made so far that the perfusion tube 15 constitutes the center of the intraocular surgical tip 10 according to the embodiment of the present invention, . ≪ / RTI > However, in order to constitute the nozzle for high-pressure injection of the perfusion liquid, it is more preferable that the perfusion tube 15 constitutes the center of the intra-ocular surgical tip 10. In addition, since the conventional suction port 130 is provided at the distal end of the intraocular surgical tip 10, when the user makes a mistake, the bladder 5 instantaneously (about 0.2 second or less) An accident in which a considerable sound pressure is applied to the air bag 5 may occur. However, since the suction port 13 according to the embodiment of the present invention is provided on the side surface other than the best end of the intraocular surgical tip 10, It is more preferable that the perfusion tube 15 constitutes the center of the in-eye surgical tip 10.

Accordingly, the surgical tip in the eye according to one embodiment of the present invention provides a new intraocular paradigm for removing the intraocular tissue by removing the intraocular tissue from the removal of the intraocular tissue through the conventional negative pressure. Equipment.

Conventionally, the focus has been on the provision of sound pressure, as a method of removing intraocular tissue such as lens nucleus or cortex. As a result, conventional intraocular surgical tips, intraocular surgical handpieces, and intraocular surgery systems have been problematic in terms of how to maintain the sound pressure stably. In addition, the prior art intra-ocular surgery tip has been limited to the conventional technique only for overcoming the medical accident that occurs when the patient suffers from sucking in the nipple.

It has been difficult to think of producing a device that separates the cortex from the sac by positive pressure, since pulverizing the nucleus into an ultrasonic beam has already become the industry standard for ultrasonic emulsification, and the sound pressure does not require crushing the cortex unlike the nucleus. An intraocular surgical tip using a positive pressure in accordance with an embodiment of the present invention is an advanced invention that overturns this conventional accident.

According to the embodiment of the present invention, since the cortical remnant can be operated without replacing the surgical instrument, a remarkable effect such as a shortening of the operation time, a reduction of the side effects of surgery, and a reduction in the incidence of medical accidents can be generated.

Also, according to one embodiment of the present invention, the cortical body 4 can be removed by using the in-eye surgical handpiece 200 having the conventional I & A irrigation and aspiration function. After the removal of the cortex has been completed to a certain extent, the cortical remnants can be easily and safely removed using the handpiece provided with the intraocular surgical tip according to one embodiment of the present invention.

Intraocular  Surgical Handpiece

An intraocular surgical handpiece 200 can be provided which is capable of replacing the intraocular surgical tip 10 described above. The intraocular surgical handpiece 200 according to an embodiment of the present invention may be configured in a columnar shape so that the user can easily grasp the handpiece, and the intraocular surgical tip 10 may be mounted or dismounted at the front end An insertion port can be formed.

In other words, the handpiece for intraocular surgery according to one embodiment of the present invention is a new intraocular paradigm for removing the intraocular tissue by removing the intraocular tissue from the removal of the intraocular tissue through the conventional negative pressure. Equipment.

Intraocular  Surgical System

An intraocular surgical system including the intraocular surgical tip 10 described above may be provided. The intraocular surgery system according to an embodiment of the present invention may further include an electric pump such as an inverter or a pumping means such as a hydraulic pump in the perfusion solution receiving portion 220, unlike the conventional intraocular surgery system. Also, the pressure of the perfusion liquid injected from the injection port 16 of the perfusion tube 15 can be stably controlled by the perfusion liquid storage part 220.

That is, the intraocular surgery system according to an embodiment of the present invention is to provide a new intraocular paradigm for realizing the removal of the intraocular tissue through the positive pressure by removing the intraocular tissue through the conventional sound pressure System.

As described above, those skilled in the art will appreciate that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

1: eyeball
2: lens
3: Nuclei
4: Cortical
4a: Cortical residue
5: sac
6: cornea
7: incision
8: Intraocular lens
10: Tips
11: Aspirator
12: Aspiration path
13: Sucking population
14: perfusion pathway
15: perfusion tube
16:
100: Conventional tip
110: Suction tube
120: suction path
130:
140: perfusion pathway
150: perfusion tube
160: perfusion port
200: Handpiece
220:
230: Vacuum pump

Claims (10)

A perfusion tube having one end connected to a perfusion liquid containing portion for containing a perfusion liquid and the other end having a jet opening for injecting the perfusion liquid and providing a specific positive pressure in the eyeball with the perfusion liquid supplied from the perfusion liquid containing portion; And
A suction pipe configured to surround the perfusion tube, one end connected to a vacuum pump, the other end having a suction port, and sucking the biotissue in the eyeball outward through the suction port;
/ RTI >
Wherein the perfusion tube and the suction tube are inserted into the eyeball and the living tissue separated from the cuvette by the specific positive pressure of the perfusion liquid provided in the perfusion tube is sucked by the suction tube. tip.
The method according to claim 1,
Wherein the perfusion tube is protruded by a specific length at an end of the suction tube.
The method according to claim 1,
Wherein the specific positive pressure is 50 to 150 mmHg.
The method according to claim 1,
Wherein the injection port is composed of a multi-port having a plurality of nozzles.
The method according to claim 1,
Wherein the suction port is provided with at least one tip end portion of the suction tube.
An intraocular surgical tip according to claim 1; And
A handle having a hollow columnar shape and having one side inserted with the intraocular surgical tip inserted therein;
Lt; / RTI >
Wherein the surgical tip in the eye is configured to be mounted on and dismounted from the handle.
An intraocular surgical tip according to claim 1;
A handle having a hollow columnar shape and having one side inserted with the intraocular surgical tip inserted therein;
A vacuum pump for providing a suction pressure to a suction tube which is a constituent of the intraocular surgical tip; And
A perfusate receiving portion for providing a perfusion fluid having a specific positive pressure to the perfusion tube which is a constituent of the intraocular surgical tip;
Lt; / RTI >
Wherein the intraocular surgical tip is configured to be mountable and dismountable to the handle.
8. The method of claim 7,
Wherein the perfusion liquid receiving portion further comprises pumping means for generating the specific positive pressure of the perfusion liquid and pressure adjusting means configured to adjust the specific positive pressure.
8. The method of claim 7,
Wherein the specific positive pressure is between 50 and 150 mm Hg.
8. The method of claim 7,
Wherein the perfusion tube is protruded by a specific length at an end of the suction tube.

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