CN220558060U

CN220558060U - Vertebral plate forceps

Info

Publication number: CN220558060U
Application number: CN202320705423.8U
Authority: CN
Inventors: 王宇鹏; 银和平; 吴一民; 李树文; 白明; 杜志才
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2024-03-08
Anticipated expiration: 2033-04-03

Abstract

The present utility model provides a laminar clamp comprising: the clamp body main body comprises a fixed clamp body and a fixed handle extending downwards along the tail part of the fixed clamp body; an elastic part is arranged between the fixed handle and the movable handle; the movable clamp body is movably arranged on the fixed clamp body and is suitable for moving relative to the fixed clamp body under the drive of the movable handle; at least one of the first biting piece and the second biting piece is provided with a biting cutting edge, and a biting cutting area is formed between the first biting piece and the second biting piece; through setting up the passageway, along with the going on of operation, there is more and more tissues gradually to enter into the middle of the passageway, can play the effect of accomodating to the tissue through the passageway, can avoid just directly taking out the lamina forceps from the human body after accomplishing once the separation to the tissue at every turn, also can avoid the lamina forceps to get in and out the infection risk that the human body brought for many times when improving operation efficiency.

Description

Vertebral plate forceps

Technical Field

The utility model relates to the technical field of medical equipment, in particular to a pair of vertebral plate forceps.

Background

The vertebral plate forceps are mainly applied to spinal surgery, and spinal nerves and dural sacs are exposed by removing vertebral plates or articular processes.

The utility model provides a vertebral plate forceps structure among the prior art, include by the body of the pincers main part, assist the functional part, movable handle and several parts such as elastic part constitute, set up at the tip of assisting the functional part and bite the piece, and offered rectangular through-hole above that to form and bite cutting edge and broken bone and hold the chamber, correspondingly, be provided with at the tip of main functional part with bite the cutting platform of cutting piece looks adaptation. Therefore, the vertebral plate forceps are extremely simple in structure, and the movable handles can transmit force to the biting cutting edges by means of the lever principle, so that the holding force is greatly reduced.

However, when the biting piece finishes the biting action on the tissues, the gripped tissues are repeatedly taken out of the human body, and then the forceps are put into the human body again to repeatedly grip the tissues. Meanwhile, as the vertebral plate forceps need to go in and out of the human body for many times, certain pollution to the human body is inevitably caused, and further the infection of a patient after operation is caused.

Disclosure of Invention

Therefore, the utility model aims to overcome the defects that the vertebral plate forceps in the prior art need to enter and exit the human body for many times and are easy to cause infection to the human body.

To this end, the utility model provides a laminar clamp comprising: the clamp body main body comprises a fixed clamp body and a fixed handle extending downwards along the tail part of the fixed clamp body; an elastic part is arranged between the fixed handle and the movable handle; the movable clamp body is movably arranged on the fixed clamp body and is suitable for moving relative to the fixed clamp body under the drive of the movable handle; the first biting piece is arranged at the end part of the movable clamp body, a second biting piece is formed at the position, corresponding to the first biting piece, of the fixed clamp body, at least one of the first biting piece and the second biting piece is provided with a biting cutting edge, and a biting region is formed between the first biting piece and the second biting piece; and the channel is arranged on the movable clamp body, one end of the channel is communicated with the biting region, and tissues in the biting region can enter the channel under the extrusion of the first biting piece and the second biting piece.

The utility model provides a pair of vertebral plate forceps, which comprises a main body part and at least one part of detachable part arranged on the main body part;

further, a protruding portion is provided on an end face of one of the detachable portion and the main body portion, and a recessed portion is provided on the other of the detachable portion and the main body portion.

The convex parts of the vertebral plate forceps are spherically arranged.

The convex parts are arranged at the two end face positions of the detachable part.

According to the vertebral plate forceps provided by the utility model, the channel is formed by the detachable part and the movable forceps body in an involution way, the movable forceps body is provided with the notch corresponding to the biting region, and the notch is communicated with the detachable part.

Further, a buckle is arranged on the movable clamp body, and a clamping groove is arranged on the detachable part corresponding to the buckle.

According to the vertebral plate forceps provided by the utility model, at least a part of the detachable part is arranged in a transparent mode.

The vertebral plate forceps provided by the utility model are characterized in that the channel is internally provided with the crushing part for crushing tissues in the channel; a delivery portion for delivering tissue into the passageway to a rear portion of the passageway.

The utility model provides a pair of vertebral plate forceps, wherein the conveying part comprises: a connecting rod disposed in the channel, and a helical blade disposed around the connecting rod; and the power motor is in power connection with the connecting rod, the power motor is arranged outside the movable clamp body, and a gear pair is arranged between the output end of the power motor and the connecting rod.

The conveying part is a negative pressure suction device which is arranged at the rear end of the channel and is connected with the channel.

According to the vertebral plate forceps provided by the utility model, the fixing forceps body is provided with the waterway channels arranged along the length direction, one ends of the waterway channels penetrate through the head parts of the fixing forceps to form water outlets, the other ends of the waterway channels extend to the tail parts of the fixing forceps body and form water inlets, and the water inlets are used for connecting water pipes.

The utility model provides a pair of vertebral plate forceps, wherein a light path through groove is formed in one side of a fixed forceps body, which is positioned on the water path through groove, one end of the light path through groove penetrates through the head of the fixed forceps, the other end of the light path through groove extends to the tail of the fixed forceps body and forms a light path inlet, an imaging module is arranged in the light path through groove, and the light path inlet is used for being connected with a visual light source imaging system.

The two waterway barrel grooves comprise a water inlet through groove and a water outlet through groove.

The technical scheme of the utility model has the following advantages:

1. the utility model provides a vertebral plate forceps, comprising: the clamp body main body comprises a fixed clamp body and a fixed handle extending downwards along the tail part of the fixed clamp body; an elastic part is arranged between the fixed handle and the movable handle; the movable clamp body is movably arranged on the fixed clamp body and is suitable for moving relative to the fixed clamp body under the drive of the movable handle; the first biting piece is arranged at the end part of the movable clamp body, a second biting piece is formed at the position, corresponding to the first biting piece, of the fixed clamp body, at least one of the first biting piece and the second biting piece is provided with a biting cutting edge, and a biting region is formed between the first biting piece and the second biting piece; and the channel is arranged on the movable clamp body, one end of the channel is communicated with the biting region, and tissues in the biting region can enter the channel under the extrusion of the first biting piece and the second biting piece.

Through setting up the passageway, along with the going on of operation, there is more and more tissues gradually to enter into the middle of the passageway, can play the effect of accomodating to the tissue through the passageway, can avoid just directly taking out the laminar clamp from the human body after accomplishing once the separation to the tissue at every turn, also can avoid the laminar clamp to get in and out the human infection risk that brings for the human body many times when improving operation efficiency, has characteristics such as efficient, save time, security height. Meanwhile, the resected bone tissue can be used for bone grafting, and is a good bone grafting material. The utility model can cut off the vertebral lamina and the articular process joint, with high practicability.

2. According to the vertebral plate forceps provided by the utility model, the detachable part is arranged in a transparent manner, so that an operator can conveniently observe the filling degree in the detachable part in time, and the detachable part can be conveniently taken down and tissues can be conveniently cleaned.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the construction of a laminectomy forceps provided by the present utility model;

FIG. 2 is a partial schematic view of the area A in FIG. 1;

FIG. 3 is a cross-sectional view of B-B of FIG. 1;

FIG. 4 is a cross-sectional view of a removable portion of the movable clamp body;

fig. 5 is a schematic structural view of the conveying section;

FIG. 6 is a partial schematic view of the region A in FIG. 1 corresponding to the embodiment 2;

fig. 7 is a cross-sectional view of the region C-C of fig. 1.

Description of the reference numerals in the examples:

1. a body main body; 2. a movable clamp body; 201. a notch; 3. a movable handle; 4. a bite region; 5. an elastic part; 6. a channel; 7. a boss; 8. a detachable portion; 9. a helical blade; 10. a gear pair; 11. a negative pressure generating device; 12. a fixed handle; 13. fixing the clamp body; 14. a power motor; 15. a connecting rod; 16. a waterway channel; 17. the light path is through the groove.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

Example 1

The present embodiment provides a laminectomy forceps, as shown in fig. 1-6, for spinal disc herniation, spinal stenosis, and slipping disease, etc. It should be noted that, the sizes of the laminectomy forceps provided in this embodiment need to be adjusted according to the internal structure, and compared with the laminforceps with smaller sizes in the prior art, the laminforceps provided in this embodiment may be different multiples of the laminforceps in the prior art, and may be micro-forceps or macro-forceps. Specifically, the laminectomy forceps include:

comprising the following steps: the clamp body main body 1 comprises a fixed clamp body 13 and a fixed handle 12 extending downwards along the tail part of the clamp body;

as shown in fig. 1, the fixation clamp 13 itself will be in a relatively stationary state during the surgical procedure. The fixed handle 12 itself extends downward in the drawing so as to form a space for the operator to hold.

A movable handle 3, wherein an elastic part 5 is arranged between the fixed handle 12 and the movable handle 3;

specifically, the movable handle 3 and the fixed handle 12 perform relative opening and closing movement, the fixed handle 12 is relatively static during operation, and the movable handle 3 performs approaching or separating movement relative to the fixed handle 12. Meanwhile, in order to facilitate the operation and ensure that the movable handle 3 can be opened relative to the fixed handle 12, an elastic part 5 is further arranged between the fixed handle 12 and the movable handle 3, and the elastic part 5 can provide a force for opening the movable handle 3 relative to the fixed handle 12, so that the movable handle 3 can be opened naturally when no force is applied to the hand of an operator.

Specifically, the elastic portion 5 itself is constituted by at least one elastic piece. As an embodiment, the device comprises a first elastic piece and a second elastic piece, wherein the first elastic piece is fixed with the fixed handle 12 through a rivet, and the second elastic piece is fixed with the movable handle 3 through a rivet. A notch is formed at the free end (inner end) of the first elastic sheet, an embedded part embedded into the notch is formed at the free end of the second elastic sheet, and the embedded part penetrates through the notch, so that the embedded part can slide freely when the movable handle 3 is held or put. In this embodiment, the spring plate is not required to ensure the rebound effect, and may be made of spring steel.

The movable clamp body 2 is movably arranged on the fixed clamp body 13 and is suitable for moving relative to the fixed clamp body 13 under the drive of the movable handle 3;

in this embodiment, in order to realize the connection between the movable clamp body 2 and the fixed clamp body 13, a through hole is formed in the fixed clamp body 13 for the movable handle 3 to pass through. The movable handle 3 is connected with the clamp body main body 1 in a hinged mode, and meanwhile, the movable handle 3 is connected with the movable clamp body 2 in a hinged mode to form an action lever.

The first biting piece is arranged at the end part of the movable clamp body 2, a second biting piece is formed at the position of the fixed clamp body 13 corresponding to the first biting piece, at least one of the first biting piece and the second biting piece is provided with a biting cutting edge, and a biting region 4 is formed between the first biting piece and the second biting piece;

by combining the first and second bites, a bite region 4 may be formed between the first and second bites, and during surgery, as the bite region 4 is reduced, a bite operation for tissue, bone, or the like may be completed, and the resulting tissue may be received into the bite region 4. In this way, the movable handle 3 can transmit force to the biting blade by means of the lever principle, and the holding force is greatly reduced.

Specifically, the biting cutting edge may be disposed on the first biting cutting member, may be disposed on the second biting cutting member, and may be disposed on both the first biting cutting member and the second biting cutting member.

In this embodiment, to ensure that the bite action is achieved, the first bite piece and the second bite piece may be angled as illustrated in fig. 2, and an angle of inclination of 30-50 may be defined.

And a channel 6, which is arranged on the movable clamp body 2 and one end of which is communicated with the biting and cutting area 4.

Specifically, the channel 6 itself has a certain length, and the length is not limited, and may be only a small section, or may extend through the entire length direction of the movable clamp body 2. Through setting up passageway 6, can accomodate the passageway 6 constantly with the inside tissue that holds of bite district 4 in, can avoid just directly taking out the laminar clamp from the human body after accomplishing once the separation to the tissue at every turn, also can avoid the laminar clamp to get in and out the infection risk that the human body brought many times while improving operation efficiency.

Further, as shown in fig. 3, the cross-sectional shape of the passage 6 itself is not limited, and may be a regular shape such as a circular shape, a rectangular shape, an elliptical shape, or the like. But may be irregularly shaped as long as access and containment of tissue is enabled.

As shown in fig. 4, the movable forceps body 2 includes a main body portion and at least a part of detachable portion 8 provided on the main body portion,

after the tissue quantity in the channel 6 is accumulated to a certain extent, the detachable part 8 is detached from the main body part, and the cleaning operation of the channel 6 can be completed, so that the working efficiency of the vertebral plate forceps can be effectively improved.

Specifically, the boss 7 may be provided on the detachable portion 8 or may be provided on the main body portion as long as the fitting action can be completed.

Further, the connection method of the detachable portion is not limited. As an implementation mode, a structure similar to a hinge can be arranged between the detachable part and the main body part, when the detachable part is opened, a channel can be formed, and at the moment, the detachable part and the movable clamp body are not separated directly;

as another embodiment, the end face of one of the detachable part and the main body part is provided with a convex part 7, and the other end face is correspondingly provided with a concave part.

Specifically, when the detachable portion needs to be detached from the movable clamp body, a certain pulling force needs to be provided on the detachable portion, so that the detachable portion is separated.

Further, the shape of the boss itself is not limited, and may be a regular shape or an irregular shape as long as it has a certain convex shape. As shown in fig. 4, the protrusions are spherically arranged.

In this embodiment, the detachable portion 8 is made of a deformable material, and the type of the material is not limited, so long as the detachable portion is subjected to a certain tensile force or pushing force or can be deformed. Can be made of various materials in the prior art such as plastic, wood, bamboo and the like.

Still further, it is ensured that the number of tissues inside the channel 6 can be observed in time, and at least a part of the detachable portion 8 in this embodiment is arranged in a transparent manner, so that it is ensured that an operator can observe the conditions inside the channel 6 in time conveniently. At this time, the detachable portion 8 is made of a transparent plastic material, which has both a certain strength and a certain deformability, and is convenient to observe.

In this embodiment, as shown in fig. 5, in order to avoid accumulation of tissue in the channel 6 at the front end of the channel 6, to affect the entry of subsequent tissue into the channel 6, the channel 6 is provided with:

a crushing section for crushing the tissue in the passage;

specifically, the structure of the pulverizing part itself is not limited, and it may be a cutter for cutting off tissues commonly used in clinic, and bulk tissues are scattered by the pulverizing part so as to facilitate subsequent transportation;

a delivery section for delivering tissue into the channel 6 to the rear of said channel 6.

Further, the structure of the conveying section itself is not limited. So long as it is able to provide a certain force to the tissue in the channel 6.

As one embodiment, the conveying section includes: a connecting rod 15 disposed in the passage 6, and a helical blade 9 disposed around the connecting rod 15; and a power motor 14, which is in power connection with the connecting rod 15.

As shown in fig. 5, the spiral blade 9 is disposed along the length direction of the channel 6, and by disposing the spiral blade 9, when the spiral blade rotates, the tissue inside the channel 6 can be pushed to move from left to right in fig. 5, so as to ensure that the tissue is not stacked in the channel 6, further ensure that more tissue can continuously enter the channel 6, and further ensure the operation efficiency.

Further, in this embodiment, the outer edge of the spiral blade 9 may be polished to form a blade-like structure, and the structure may also function as a crushing portion, that is, an effect of crushing and conveying the tissue one time may be achieved.

Further, the power motor 14 itself may be placed in the passage 6, or may be disposed outside the passage 6; as shown in fig. 5, the power motor 14 itself may be placed outside the channel 6, thereby facilitating subsequent removal and replacement operations. In addition, in the working process of the power motor 14, stability of the power motor 14 itself needs to be ensured, in this embodiment, a frame body may be provided between the power motor 14 and the movable clamp body 2, the frame body itself is stabilized on the movable clamp body 2, synchronous movement of the power motor 14 and the movable clamp body 2 can be realized through the frame body, and no slipping between the power motor 14 and the connecting rod 15 can be ensured.

Further, the transmission mode between the connecting rod 15 and the power motor 14 is not limited, and a conventional belt can be adopted for transmission; in this embodiment, the connecting rod 15 and the power motor 14 are driven by the gear pair 10, and the gear pair 10 may select a bevel gear, so as to convert the vertical rotation of the output end of the power motor 14 into the horizontal rotation of the connecting rod 15. Meanwhile, in order to realize that the output end of the power motor 14 can extend into the connecting rod 15, a through hole is formed at the top of the movable clamp body 2, and the through hole is used for the input of the output end of the power motor 14.

As another embodiment of the delivery unit, in order to ensure that the tissue removed during the surgical procedure is continuously introduced into the interior of the channel 6, the delivery unit employs a negative pressure generating device 11, the negative pressure generating device 11 being connected to the channel 6 by means of a suction tube for providing a negative pressure to the channel 6. Specifically, the negative pressure generating device 11 may be a negative pressure pump commonly used in the prior art, after the negative pressure pump is started, it may provide suction for the channel 6, as in the view angle shown in fig. 5, the negative pressure pump may enable tissues to continuously move from the left side to the right side in the figure, and then be discharged to the outside of the vertebral plate forceps under the driving of the negative pressure generating device 11, so that the vertebral plate forceps need not to be taken out to the outside of the human body separately in the operation process, further the operation efficiency is ensured, and the infection risk of the patient is reduced.

Further, as shown in fig. 7, a waterway groove 16 is provided on the fixed clamp body, the waterway groove has one end penetrating the head of the fixed clamp to form a water outlet, the other end extending to the tail of the fixed clamp body to form a water inlet, and the water inlet is used for connecting a water pipe.

The water pipe itself is directly connected with the water pump, and external water is introduced into the waterway groove 16 through the water pipe after the water pump is started, and then flows out from the left end of the fixing inlay in fig. 1. In order to achieve the introduction of water into the laminar clamp, an opening extending downwards can be provided in the fixation inlay, which opening is intended to be connected to a water pipe.

Meanwhile, the water pump can realize the cleaning action on the tissues, and can also realize the attraction on the tissues through reverse rotation, and at the moment, the tissues enter the nucleus pulposus clamp along with water under the drive of the water pump and further flow to the outside of the nucleus pulposus clamp.

As another implementation mode, the water channel through grooves are arranged on two sides of the light channel through grooves, the two water channel barrel grooves comprise a water inlet through groove and a water outlet through groove, and at the moment, clean water which does not participate in flushing operation washes tissues through the water inlet through grooves and then flows out of the vertebral plate forceps through the water outlet through grooves.

As shown in fig. 7, in order to implement the illumination operation in the operation process, an optical path through groove 17 is disposed on the fixed forceps body and located at one side of the water path through groove, one end of the optical path through groove penetrates through the head of the fixed forceps, the other end extends to the tail of the fixed forceps body and forms an optical path inlet, an imaging module is disposed in the optical path through groove, and the inlet of the optical path through groove 17 is used for connecting with a visual light source imaging system.

Light from the light source enters from the right in fig. 1 and then exits further from the left end of the fixed inlay. The light source is not limited as long as it can be a device that irradiates the light passage groove and can eject the lamp tube from the fixed inlay.

Example 2

The present embodiment is based on embodiment 1, in this embodiment, the channel is formed by the detachable portion and the movable clamp body, and a notch corresponding to the biting region is formed on the movable clamp body, and the notch is communicated with the detachable portion.

Specifically, as shown in fig. 6, first, a notch 201 is formed in the movable jaw body 2, through which the tissue inside the bite area can be guided, and simultaneously, the detachable portion 8 is mounted on the movable jaw body and connected to the movable jaw body, and in the above-described manner, the tissue passing through the notch can be entered into the detachable portion, so that the detachable portion completes the storing operation of the tissue.

Further, in order to realize the dismounting operation of the detachable part and the movable clamp body, a buckle is arranged on the detachable part, a clamping groove is correspondingly arranged on the movable clamp body, and when the detachable part is required to be connected to the movable clamp body, an external force acts on the detachable part, so that the buckle is embedded into the clamping groove; when the detachable part is required to be taken down from the movable clamp body, the detachable part is only required to be pulled down forcefully. Specifically, in order to ensure that the buckle can stably enter the clamping groove, the detachable portion itself may be limited to a deformable material, such as a plastic material.

As an embodiment, the detachable portion itself may be provided in a transparent cylindrical structure, thereby facilitating the tissue accommodation and replacement operations.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A laminar clamp, comprising:

the clamp body main body comprises a fixed clamp body and a fixed handle extending downwards along the tail part of the fixed clamp body;

an elastic part is arranged between the fixed handle and the movable handle;

the movable clamp body is movably arranged on the fixed clamp body and is suitable for moving relative to the fixed clamp body under the drive of the movable handle;

the first biting piece is arranged at the end part of the movable clamp body, a second biting piece is formed at the position, corresponding to the first biting piece, of the fixed clamp body, at least one of the first biting piece and the second biting piece is provided with a biting cutting edge, and a biting region is formed between the first biting piece and the second biting piece;

and the channel is arranged on the movable clamp body, one end of the channel is communicated with the biting region, and tissues in the biting region can enter the channel under the extrusion of the first biting piece and the second biting piece.

2. The laminar clamp of claim 1, wherein the movable clamp body includes a main body portion and at least a portion of the removable portion is disposed on the main body portion.

3. The laminar clamp according to claim 1, characterized in that said channel is formed by the apposition of a removable portion with said movable clamp body, said movable clamp body being formed with a notch corresponding to the bite area, said notch being in communication with said removable portion.

4. A pair of laminar pliers according to claim 3, wherein the movable pliers body is provided with a buckle, and the detachable part is provided with a clamping groove corresponding to the buckle.

5. The laminar clamp according to claim 2, characterized in that the end face of one of the detachable portion and the main body portion is provided with a protruding portion, and the other is provided with a recessed portion.

6. The laminectomy forceps of claim 5, wherein the protruding section is provided at both end surface locations of the detachable section and is spherically disposed.

7. A laminar clamp according to claim 2 or 3, characterized in that at least a part of the detachable portion is provided in a transparent form.

8. The laminar clamp according to claim 1, characterized in that said channel has disposed therein:

a crushing section for crushing the tissue in the passage;

a delivery portion for delivering tissue into the passageway to a rear portion of the passageway.

9. The laminar clamp according to claim 8, characterized in that said delivery portion comprises: a connecting rod disposed in the channel, and a helical blade disposed around the connecting rod; and the power motor is in power connection with the connecting rod, the power motor is arranged outside the movable clamp body, and a gear pair is arranged between the output end of the power motor and the connecting rod.

10. The laminar clamp according to claim 8, characterized in that said delivery portion is a negative pressure suction device provided at the rear end of the channel, connected to the channel.