阅读说明：本技术 一种子宫颈球囊扩张机构 (Cervical balloon dilatation mechanism ) 是由 田万山 周颂 崔雨金 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种子宫颈球囊扩张机构,包括导管,所述导管的近端包括Y形头,所述导管的远端设置有第一球囊,还包括第二球囊,其设置于所述近端,其与所述第一球囊相连通；第一挤压机构,其用于挤压所述第二球囊以使其体积发生变化。本发明提供的一种子宫颈球囊扩张机构,在近端设置一个与第一球囊连通的第二球囊,如此通过第一挤压机构去挤压第二球囊即可调节第一球囊的大小,进而调节第一球囊对宫颈口的压力,如此更加适配不同的挤压需求。(The invention discloses a cervical balloon dilatation mechanism, which comprises a catheter, wherein the near end of the catheter comprises a Y-shaped head, the far end of the catheter is provided with a first balloon, and the cervical balloon dilatation mechanism also comprises a second balloon, the second balloon is arranged at the near end and communicated with the first balloon; a first compression mechanism for compressing the second balloon to cause a change in volume thereof. According to the cervical balloon dilatation mechanism provided by the invention, the second balloon communicated with the first balloon is arranged at the near end, so that the size of the first balloon can be adjusted by extruding the second balloon through the first extrusion mechanism, and further, the pressure of the first balloon on the cervical orifice is adjusted, and thus different extrusion requirements are adapted better.)

1. The utility model provides a cervical sacculus expanding mechanism, includes the pipe, the near-end of pipe includes Y shape head, the distal end of pipe is provided with the first sacculus that is used for extrudeing the internal orifice of cervix and is used for extrudeing the third sacculus of the external orifice of cervix, its characterized in that still includes:

a second balloon disposed at the proximal end in communication with the first balloon;

a first compression mechanism for compressing the second balloon to cause a change in volume thereof.

2. The cervical balloon dilation mechanism according to claim 1 further comprising an elastic shell disposed at the proximal end, the second balloon being located within the elastic shell, the first compression mechanism being attached to the elastic shell.

3. The cervical balloon dilation mechanism of claim 2 wherein the elastic shell comprises an elastic cone body, the larger diameter end of the elastic cone body is provided with a soft material, and the elastic cone body is provided with an axial gap;

the first extrusion mechanism comprises a first cylinder body which is arranged on the elastic cone cylinder body in a threaded sleeve mode, and the elastic cone cylinder body deforms due to rotation of the first cylinder body.

4. The cervical balloon dilation mechanism of claim 1 further comprising a rigid barrel within which the second balloon is compressed.

5. The cervical balloon dilation mechanism of claim 4,

the first extrusion mechanism comprises a second cylinder body which is sleeved on the outer wall of the hard cylinder body in a threaded manner, a pressurizing column is arranged in the second cylinder body, and the pressurizing column is located in the hard cylinder body and extrudes the second balloon.

6. The cervical balloon dilatation mechanism of claim 5 further comprising a check mechanism, wherein the check mechanism comprises an annular tooth structure arranged on the outer wall of the rigid cylinder, a check rod is rotatably connected to the second cylinder, one end of the check rod is inserted into the annular tooth structure, the check rod can only swing in one direction on the second cylinder, and the swing direction of the check rod is opposite to the direction of the rotary pressurization of the second cylinder.

7. The cervical balloon dilatation mechanism according to claim 6, wherein the second cylinder is provided with a strip-shaped hole, and the check rod is attached to the side wall of the strip-shaped hole in the length direction so as to be capable of swinging only in one direction.

8. The cervical balloon dilation mechanism of claim 1,

the part of the first sacculus, which is used for pressurizing the internal opening of the cervix, is provided with a first pressure sensor, and the proximal end is provided with a display mechanism for displaying a pressure value detected by the pressure sensor.

9. The cervical balloon dilation mechanism of claim 8,

a fourth balloon disposed at the proximal end in communication with the third balloon;

a second compression mechanism for compressing the fourth balloon to change its volume.

10. The cervical balloon dilation mechanism of claim 9 wherein the portion of the third balloon that is used to pressurize the internal cervical os is provided with a second pressure sensor, and the display mechanism further displays the pressure value detected by the second pressure sensor.

Technical Field

The invention relates to a medical instrument, in particular to a cervical balloon dilatation mechanism.

Background

It is known that a cervical balloon dilatation mechanism is the first choice of instruments for promoting cervical softening and ripening during childbirth, due to its ability to provide slow, sustained mechanical stimulation and no pharmacological effects.

For example, the patent publication No. CN212756810U, the applicant is Beijing cooperative hospital of Chinese medical academy of sciences, the publication No. 20210323 entitled "Disposable saccule uterine support", which comprises a liquid-filled expansion balloon, wherein a hollow pipe is arranged at one side of the liquid-filled expansion balloon, a sealing connecting block is arranged between the hollow pipe and the liquid-filled expansion balloon, and the sealing connecting block is respectively connected with the liquid-filled expansion balloon and the hollow tube in a sealing way, one side of the hollow tube is provided with a catheter seat, the catheter seat is jointed and connected with the hollow pipe, the catheter is arranged in the hollow pipe, two ends of the catheter respectively extend to the liquid-filled expansion balloon and the catheter seat, an injection tube is arranged on one side of the catheter seat, an injection port is arranged between the injection tube and the catheter seat, and one end of the injection port penetrates through the catheter seat and extends into the catheter. Is one of the more typical cervical balloon dilation mechanisms.

In the prior art, because the saccule is positioned in the human body and the extrusion degree of the saccule to the cervix cannot be obtained, a fixed standard is adopted to control the pressure in the operation, for example, a woman with the weight of 50-60kg needs to inject 40ml of saline into the saccule. This obviously has the disadvantage that the degree of expansion of the cervix is different during use of the balloon, and that a constant compression force cannot adapt to this different expansion.

Disclosure of Invention

The invention aims to provide a cervical balloon dilatation mechanism to solve the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

a cervical balloon dilation mechanism comprising a catheter, the proximal end of the catheter including a Y-shaped head, the distal end of the catheter being provided with a first balloon, further comprising:

a second balloon disposed at the proximal end in communication with the first balloon;

a first pressing mechanism for pressing the second balloon to change its volume;

the cervical balloon dilatation mechanism further comprises an elastic shell, the elastic shell is arranged at the proximal end, the second balloon is located in the elastic shell, and the first extrusion mechanism is connected to the elastic shell.

In the cervical balloon dilatation mechanism, the elastic shell comprises an elastic cone body, a hard shell is arranged at one end with a larger diameter on the elastic cone body, and an axial gap is formed in the elastic cone body;

the first extrusion mechanism comprises a first cylinder body which is arranged on the elastic cone cylinder body in a threaded sleeve mode, and the elastic cone cylinder body deforms due to rotation of the first cylinder body.

The cervical balloon dilatation mechanism further comprises a hard cylinder, and the second balloon is extruded in the hard cylinder.

In the cervical balloon dilatation mechanism, the first extrusion mechanism comprises a second cylinder body sleeved on the outer wall of the hard cylinder body in a threaded manner, a pressurization column is arranged in the second cylinder body, and the pressurization column is located in the hard cylinder body and extrudes the second balloon.

Foretell cervix sacculus expanding mechanism still includes contrary mechanism of ending, contrary mechanism of ending including set up in the annular tooth structure of stereoplasm barrel outer wall rotates on the second barrel and is connected with contrary check rod, the one end of contrary check rod peg graft in annular tooth structure is last, contrary check rod only can unidirectional swing on the stereoplasm barrel, and its swing direction with the pressurized opposite direction is rotated to the second barrel.

The cervix balloon dilatation mechanism is characterized in that a strip-shaped hole is formed in the second cylinder, and the check rod is attached to the side wall of the strip-shaped hole in the length direction so as to only swing in a single direction.

In the cervical balloon dilatation mechanism, the first pressure sensor is arranged on the part of the first balloon for pressurizing the cervical internal orifice, and the display mechanism for displaying the pressure value detected by the pressure sensor is arranged on the proximal end.

The cervical balloon dilatation mechanism comprises a third balloon, a second connecting rod and a third connecting rod, wherein the third balloon is arranged on the distal end of the catheter and is used for pressurizing an external cervical orifice;

a fourth balloon disposed at the proximal end in communication with the third balloon;

a second compression mechanism for compressing the fourth balloon to change its volume.

In the cervical balloon dilatation mechanism, the part of the third balloon for pressurizing the cervical internal orifice is provided with the second pressure sensor, and the display mechanism also displays the pressure value detected by the second pressure sensor.

In the technical scheme, the second balloon communicated with the first balloon is arranged at the near end of the cervical balloon expansion mechanism, so that the size of the first balloon can be adjusted by extruding the second balloon through the first extruding mechanism, the pressure of the first balloon on the cervical orifice is further adjusted, and different extruding requirements are further met.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

FIG. 1 is a schematic structural view of a cervical balloon dilation mechanism according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a cervical balloon dilation mechanism according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first pressing mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an elastic cone body according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first pressing mechanism according to another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a check mechanism according to an embodiment of the present invention;

FIG. 7 is a top view of a check mechanism provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic structural view of a cervical balloon dilation mechanism according to yet another embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a first pressing mechanism according to yet another embodiment of the present invention;

fig. 10 is a schematic structural diagram of a transmission rib provided in an embodiment of the present invention.

Description of reference numerals:

1. a conduit; 1.1, a proximal end; 1.2, a distal end; 2. a first balloon; 3. a second balloon; 4. a first pressing mechanism; 4.1, a second cylinder; 4.2, a pressurizing column; 4.3, a first cylinder; 5. an elastic shell; 5.1, an elastic cone body; 5.2, axial clearance; 6. a hard cylinder; 7. a non-return mechanism; 7.1, an annular tooth structure; 7.2, a check rod; 8. a strip-shaped hole; 9. a third cylinder; 9.1, a transmission rib; 9.11, an intermediate tank; 10. a third balloon; 11. a fourth balloon; 12. a second extrusion mechanism; 13. a holding and pressing column; 14. a toothed strip; 15. a stud body; 15.1 and a strip groove.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

In various embodiments of the present invention, including the catheters provided herein, which relate to endoscopes and penetrating medical devices, the proximal end refers to the end of the body that is manipulated by a medical professional and is located outside the body, and the distal end refers to the end that enters the body to perform a direct surgical task, both proximal and distal in accordance with the present invention are explained in accordance with the established custom in the art.

As shown in fig. 1-10, the cervical balloon dilation mechanism provided in the embodiment of the present invention includes a catheter 1, a proximal end 1.1 of the catheter 1 includes a Y-shaped head, a distal end 1.2 of the catheter 1 is provided with a first balloon 2, and further includes a second balloon 3 and a first squeezing mechanism 4, the second balloon 3 is provided at the proximal end 1.1 and is communicated with the first balloon 2; a first pressing mechanism 4 for pressing the second balloon 3 to change its volume.

Specifically, the distal end 1.2 of pipe 1 is used for inserting the human body, and this end is provided with first sacculus 2 and third sacculus 10, and first sacculus 2 is used for exerting pressure for the internal orifice of cervix after opening, be used for pressurizeing the external orifice of cervix on the third sacculus 10, and first sacculus 2 cooperatees with third sacculus 10 and realizes the extrusion to external orifice of cervix and internal orifice of cervix respectively, and pipe 1's near-end 1.1 generally is for dividing into two branch pipes, forms the Y shape head similar to the tee bend promptly, also has the part to be provided with three branch pipe, and this is prior art, does not describe in detail. Be provided with second sacculus 3 on the branch pipe that pipe 1 near-end 1.1 is used for injecting salt solution, the second sacculus passes through pipe 1 and first sacculus 2 intercommunication, so to second sacculus 3, first sacculus 2 and both be located the inside intercommunication part of pipe 1, the three can maintain the unanimity of pressure owing to being in the communicating state, it is corresponding, can control the size of first sacculus 2 through extrusion second sacculus 3, just also corresponding pressure to the internal os of cervix that has adjusted first sacculus 2, thereby can realize the regulation to internal extrusion force through extrusion second sacculus again in the art in vitro.

In this embodiment, the first pressing mechanism 4 may be any kind of structure capable of pressing the second balloon 3, the simplest is provided with a holding cavity, the second balloon 3 is located in the holding cavity, the holding cavity is provided with a pressing member capable of reciprocating, for example, the pressing member is a cylinder, and the pressing member is screwed into the holding cavity or a piston, so that the pressing of the second balloon 3 is realized by the reciprocating motion of the pressing member.

In the present embodiment and the prior art, the pressure of the first balloon 2 is unknown, and the prior art controls the pressure of the first balloon 2 by specifying a rated injection amount, and the present embodiment can follow this method, and if the injection amount of the first balloon 2 specified in the prior art is 40ml, the present embodiment only needs to set the second balloon 3 to have the same size and material as those of the first balloon 2, and inject 80 ml. The extrusion control of the extrusion mechanism can be tested in advance, and the corresponding relation between the extrusion movement amount and the pressure of the extrusion mechanism is marked on the first extrusion mechanism 4, so that medical personnel can carry out extrusion operation according to the corresponding relation. In a preferred embodiment, a first pressure sensor may be provided on the portion of the first balloon 2 for pressurizing the internal cervical os, and in use, the first pressure sensor is pressed between the internal cervical os and the first balloon 2, and a display mechanism for displaying the pressure value detected by the pressure sensor is provided on the proximal end 1.1, so that the pressing pressure of the first balloon 2 can be known in real time and controlled by the first pressing mechanism 4.

According to the cervical balloon dilatation mechanism provided by the embodiment of the invention, the second balloon 3 communicated with the first balloon 2 is arranged at the near end 1.1, so that the size of the first balloon 2 can be adjusted by extruding the second balloon 3 through the first extruding mechanism 4, and further the pressure of the first balloon 2 on a cervical orifice is adjusted, so that different extruding requirements are met.

In another embodiment provided by the present invention, further, the present invention further comprises an elastic shell 5 disposed at the proximal end 1.1, the second balloon 3 is disposed in the elastic shell 5, the elastic shell 5 is used for positioning and accommodating the second balloon 3 so as to facilitate compression thereof, the elastic shell 5 enables the first compression mechanism 4 to compress by deforming, and the first compression mechanism 4 is connected to the elastic shell 5. The elastic shell 5 may be a shell made of an elastic material, such as a cylindrical rubber tube. Preferably, the elastic shell 5 comprises an elastic cone body 5.1, a hard shell is arranged at one end of the elastic cone body 5.1 with a larger diameter, the hard shell is used for abutting against the second balloon 3 to limit the second balloon 3, and an axial gap 5.2 is arranged on the elastic cone body 5.1; first extrusion mechanism 4 is including setting up the screw sleeve in first barrel 4.3 on the elasticity awl barrel 5.1, because first barrel 4.3 is the cylinder, it makes first barrel 4.3 move to the great one end of radial dimension from the less one end of radial dimension on elasticity awl barrel 5.1 at elasticity awl barrel 5.1 spiro union, brings elasticity awl barrel 5.1 into the cylinder gradually, and because it has axial clearance 5.2 to supply elasticity awl barrel 5.1 to take place to warp on the elasticity awl barrel, the rotation of first barrel 4.3 makes elasticity awl barrel 5.1 takes place to warp, warp gradually into the cylinder that can the adaptation with the cylinder from the toper, and this kind of deformation realizes the extrusion to second sacculus 3.

In another embodiment provided by the present invention, further, the present invention further includes a hard cylinder 6, the second balloon 3 is extruded in the hard cylinder 6, and the hard cylinder 6 can provide a better limit for the second balloon 3. Furthermore, the first extrusion mechanism 4 comprises a second cylinder 4.1 which is screwed on the outer wall of the hard cylinder 6, a pressurizing column 4.2 is arranged in the second cylinder 4.1, namely the pressurizing column 4.2 and the hard cylinder 6 are coaxially arranged, preferably, the two cylinders are of an integrated structure or a sleeved movable structure, one end of the two cylinders are connected, and an accommodating space is arranged between the other ends of the two cylinders, the end part of the hard cylinder 6 is just positioned in the accommodating space, so that a structure that the pressurizing column 4.2 is positioned in the hard cylinder 6, the hard cylinder 6 is positioned in the second cylinder 4.1, the inner wall of the second cylinder 4.1 is in threaded connection with the outer wall of the hard cylinder 6 is formed, the rotation of the second cylinder 4.1 enables the second cylinder 4.1 and the pressurizing column 4.2 to move synchronously relative to the hard cylinder 6, and the pressurizing column 4.2 is positioned in the hard cylinder 6 and presses the second balloon 3 during movement, so that the pressurizing control of the second balloon 3 is realized.

In yet another embodiment of the present invention, further, in most cases, the first balloon 2 needs to continuously squeeze the cervical orifice for several hours, which is several tens of minutes long, and the first squeezing mechanism 4 screwed with the first balloon may rotate by itself to reduce the pressure due to the pressure, as shown in fig. 5-7, the present embodiment further includes a check mechanism 7, the check mechanism 7 includes a ring-shaped tooth structure 7.1 disposed on the outer wall of the rigid cylinder 6, a check rod 7.2 is rotatably connected to the second cylinder 4.1, one end of the check rod 7.2 is inserted into the ring-shaped tooth structure 7.1, so that the check rod 7.2 and the ring-shaped tooth structure 7.1 are locked, so that the second cylinder 4.1 and the rigid cylinder cannot rotate with each other, and, at the same time, in order to have no influence in normal rotation, the check rod 7.2 can only swing in one direction on the second cylinder 4.1, as shown in fig. 6, be provided with bar hole 8 on the second barrel 4.1, contrary pole 7.2 laminating is in order only to be able one-way swing on the lateral wall of 8 length direction in bar hole, contrary pole 7.2 of ending this moment only can clockwise rotation, is caught by the lateral wall butt in bar hole 8 during anticlockwise rotation, consequently unable anticlockwise rotation. At this time, the second cylinder 4.1 rotates clockwise to enable the pressurizing column 4.2 to pressurize the second air bag, when the second cylinder 4.1 rotates clockwise, the end part of the check rod 7.2 is driven by the annular tooth structure 7.1 to enable the end part to continuously open from the annular tooth structure 7.1, the opening movement of the check rod 7.2 is clockwise rotation, so that the clockwise rotation of the second cylinder 4.1 is smooth, when the second cylinder 4.1 rotates anticlockwise, because the check rod 7.2 cannot rotate anticlockwise, the check rod 7.2 is clamped on the annular tooth structure 7.1, at this time, the check rod 7.2 must be manually stirred, the check rod 7.2 is separated from the annular tooth structure 7.1, so that the second cylinder 4.1 cannot rotate anticlockwise by itself, is locked, the clockwise rotation is not influenced, the pressurization of the second air bag is not influenced, but if the pressure is relieved, the check rod 7.2 must be manually stirred, and the pressurizing column 4.2 cannot apply the acting force to open, thus, the first pressing mechanism 4 cannot rotate by itself, so that the pressure is reduced.

In a further embodiment of the present invention, the first balloon 2 is not in communication with the third balloon 10, and correspondingly, the fourth balloon 11 is disposed at the proximal end 1.1, which is in communication with the third balloon 10; the second pressing mechanism 12 is used for pressing the fourth balloon 11 to change the volume thereof. Obviously, the cooperation of the first balloon 2, the second balloon 3 and the first squeezing mechanism 4 is completely the same as the cooperation of the third balloon 10, the fourth balloon 11 and the second squeezing mechanism 12, and it is obvious to those skilled in the art that all the structures applied to the first balloon 2, the second balloon 3 and the first squeezing mechanism 4 are all applied to the third balloon 10, the fourth balloon 11 and the second squeezing mechanism 12, and can be handled as they are. If the portion of the third balloon 10 for pressurizing the cervical internal orifice is provided with a second pressure sensor, the display means also displays the pressure value detected by the second pressure sensor. Other structures are not described in detail herein.

In still another embodiment of the present invention, as shown in fig. 8-10, the second air bag and the fourth air bag are linked, two hard cylinders 6 are respectively disposed on two branch pipes of the Y-shaped head at the injection end, wherein the second air bag is disposed in one hard cylinder 6, the fourth air bag is disposed in the other hard cylinder 6, one hard cylinder 6 is respectively sleeved at two ends of a third cylinder 9, that is, one end of one hard cylinder 6 is sleeved at one end of the third cylinder 9, one end of the other hard cylinder 6 is sleeved at the other end of the third cylinder 9, the third cylinder 9 can rotate relative to the hard cylinders 6, for limiting, a convex ring can be disposed on the outer wall of the hard cylinder 6, an annular groove is disposed on the inner wall of the third cylinder 9, the convex ring is matched with the annular groove to prevent the hard cylinder 6 from moving axially relative to the third cylinder 9, and two screw cylinders 15 are also included, the two screw cylinders 15 are in one-to-one corresponding threaded connection with the two hard cylinders 6, the rotation of the screw cylinders 15 in the hard cylinders 6 enables the screw cylinders 15 to extrude the second balloon 3 and the fourth balloon 11, one end of the screw cylinders 15 is in threaded connection with one end of the hard cylinders 6, the screw cylinders 15 are exposed out of one end of the hard cylinders 6 and are provided with strip-shaped grooves 15.1 along the axial direction, the inner wall of the third cylinder 9 is provided with transmission ribs 9.1, the transmission ribs 9.1 are inserted in the strip-shaped grooves 15.1, so that the rotation of the third cylinder 9 drives the rotation of the screw cylinders 15, the screw cylinders 15 are in threaded connection with the hard cylinders 6, the rotation enables the screw cylinders to reciprocate in the hard cylinders 6, the thread directions of the two screw cylinders 15 are opposite, when the third cylinder 9 is rotated, namely, the two screw cylinders 15 either simultaneously extrude the balloons or simultaneously separate the balloons, the first balloon 2 and the third balloon 10 are respectively arranged at two sides of the cervical orifice, the pressure applied by the first pressing mechanism 12 is basically the same as that applied by the second balloon 3 and the fourth balloon 11, and the pressure applied by the second balloon 3 and the fourth balloon 11 is basically the same as that applied by the fourth balloon, and at this time, the second pressing mechanism 12 and the first pressing mechanism 4 can be partially combined by simultaneously pressurizing and depressurizing the second balloon 3 and the fourth balloon 11 by rotating the third cylinder 9.

Still further, a toothed part is arranged on the bottom wall of the strip-shaped groove 15.1, a middle groove 9.11 is arranged on the transmission rib 9.1, a toothed strip 14 is arranged in the middle groove 9.11, the toothed strip 14 is rotatably connected in the middle groove 9.11 through a rotating shaft, abutting parts are arranged on the toothed strip 14 and positioned on the other side of the rotating shaft, namely on two sides of the rotating shaft, a toothed structure and the abutting parts are respectively arranged on the toothed strip 14, a through hole is arranged on the third cylinder 9, a holding and pressing column 13 is arranged in the through hole, one end of the holding and pressing column 13 protrudes out of the outer wall of the third cylinder 9, the other end of the holding and pressing column is abutted against the abutting parts, a torsion spring is arranged on the rotating shaft, the toothed strip 14 is meshed with the toothed part under normal condition, at the moment, the screw cylinder 15 is locked relative to the third cylinder 9 due to meshing, namely, the screw cylinder 15 cannot axially move, the rotation of the screw cylinder 15 and the third cylinder 9 is actually locked, and when the second balloon 3 and the fourth balloon 11 need to be adjusted, the holding and pressing column 13 is pressed, the holding and pressing column 13 presses the abutting portion, the toothed strip 14 rotates, the toothed strip 14 is separated from the toothed portion at the moment, locking is released, the third cylinder 9 can rotate at the moment, and the two screw cylinders 15 are driven to rotate to conduct adjustment. Because two screw cylinder 15 symmetry sets up, because two profile of tooth strips 14 also can symmetrical arrangement, two butt portions set up relatively in order to be held the post 13 butt simultaneously by one, in addition, profile of tooth strip 14 can be provided with two sets ofly, lie in the relative both sides on the screw cylinder 15, it has two to hold the post 13, the benefit of so setting lies in, under the normality condition, third barrel 9 is died by the lock, when needing to adjust, two fingers extrude two and hold the post, perhaps the one hand is held third barrel 9 and is held the post in order to extrude, realize the rotation drive when all can relieving the locking, and drive two gasbags simultaneously, and is very convenient.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.