阅读说明：本技术 一种妇产科临床用多功能双腔气囊宫颈扩张器 (Clinical multi-functional two-chamber gasbag cervical dilator of using of gynaecology and obstetrics ) 是由 张秀丽 于 2021-08-09 设计创作，主要内容包括：本发明涉及医用器具技术领域,具体涉及一种妇产科临床用多功能双腔气囊宫颈扩张器,包括扩张器主杆,所述扩张器主杆的表面胶合有弹性空囊,所述扩张器主杆的表面安装有固定机构,所述扩张器主杆的顶部安装有吸液注液机构,所述扩张器主杆的内部呈环形等距固定连接有储气仓,所述储气仓的表面对称铰接有活塞件。本发明在使用时,能够根据实际操作的需要进行宫颈内部的排液,从而避免了因宫颈内部分泌物较多出现扩张器错位滑动的情况,同时该部分结构还可用作注液装置所使用,本发明不同于老式的宫颈扩张器,该扩张器能够进行多档位的宫颈扩张,同时在扩张的过程能够自动复位,从而通过反复的扩张与收缩对宫颈进行了弹性的训练。(The invention relates to the technical field of medical appliances, in particular to a multifunctional double-cavity air bag cervical dilator for clinical obstetrics and gynecology department, which comprises a dilator main rod, wherein an elastic empty bag is glued on the surface of the dilator main rod, a fixing mechanism is arranged on the surface of the dilator main rod, a liquid suction and injection mechanism is arranged at the top of the dilator main rod, an air storage bin is fixedly connected to the inside of the dilator main rod in an annular shape at equal intervals, and piston pieces are symmetrically hinged to the surface of the air storage bin. When the cervical dilator is used, the liquid drainage in the cervix can be carried out according to the actual operation requirement, so that the situation that the dilator slides in a dislocation way due to more secretions in the cervix is avoided, and meanwhile, the partial structure can also be used as a liquid injection device.)

1. The utility model provides a clinical multi-functional two-chamber gasbag cervical dilator of using of gynaecology and obstetrics, includes dilator mobile jib (1), its characterized in that: the surface of expander mobile jib (1) veneer has elasticity empty bag (2), the surface mounting of expander mobile jib (1) has fixed establishment, imbibition liquid injection mechanism is installed at the top of expander mobile jib (1), the inside of expander mobile jib (1) is annular equidistance fixedly connected with gas storage bin (27), the surface symmetry of gas storage bin (27) articulates there is piston (12), the cover is equipped with torque spring on the articulated shaft of piston (12) and gas storage bin (27) looks articulated, torque spring's both ends are connected with gas storage bin (27), piston (12) respectively, the top of gas storage bin (27) is inserted and is equipped with piston rod (14), the surface cover of piston rod (14) is equipped with first spring (15), the bottom of first spring (15) is connected with the fixed surface of piston rod (14), the top of first spring (15) and the inside top surface fixed connection of gas storage bin (27), the inside of expander mobile jib (1) has been seted up movable groove, the movable groove that sets up through inside is inserted in expander mobile jib (1) and is equipped with inserted bar (16), the inside of expander mobile jib (1) is inserted and is equipped with drive ring (18), the one end of drive ring (18) extends to the movable inslot portion and is connected with the top of inserted bar (16), the inside of expander mobile jib (1) links to each other with transfer line (22) through adjustment mechanism, the top fixedly connected with push pedal (25) of transfer line (22), the surperficial symmetry fixedly connected with of expander mobile jib (1) is exerting oneself piece (26).

2. The multifunctional double-chamber air bag cervical dilator for clinical obstetrics and gynecology department of claim 1, characterized in that, the fixed establishment includes solid fixed ring (3), the surface cover of dilator mobile jib (1) is equipped with solid fixed ring (3), the fixed surface of solid fixed ring (3) is connected with locked ring (4), the equal fixedly connected with locking block (5) in both ends of locked ring (4), the surface of locking block (5) is through inserting through the bearing and is equipped with locking lever (6), the one end of locking lever (6) is through the locking block (5) through the screw thread, the surface symmetry fixedly connected with connecting block (7) of locked ring (4), the one end that connecting block (7) kept away from each other all is connected with rubber gasket (8) through the pivot.

3. The gynecological clinical multifunctional double-cavity air bag cervical dilator according to claim 2, characterized in that the surface of the rubber gasket (8) is provided with an arc-shaped groove, and the surface of the rubber gasket (8) is provided with anti-skid lines.

4. The multifunctional double-chamber air sac cervical dilator for obstetrics and gynecology department clinical use of claim 1, it is characterized in that the liquid suction and injection mechanism comprises a liquid storage bag (9), the liquid storage bag (9) is inserted at the top end of the main rod (1) of the dilator through threads, the top of the liquid storage bag (9) is hinged with a piston plate (10), a hinge shaft hinged with the piston plate (10) and the liquid storage bag (9) is sleeved with a torsion spring, two ends of the torsion spring are respectively connected with the liquid storage bag (9) and the piston plate (10), the top surface of the piston plate (10) is provided with a sliding groove, the piston plate (10) is connected with a locking piece (11) in a sliding way through the sliding groove arranged on the top surface, the inner surface of the liquid storage bag (9) is provided with a groove, and one end of the locking piece (11) is inserted into the groove arranged on the inner surface of the liquid storage bag (9).

5. The multifunctional double-cavity air bag cervical dilator for clinical obstetrics and gynecology department according to claim 4, wherein one end of the locking piece (11) close to the inner wall of the reservoir (9) is arc-shaped, and the opening of the groove formed on the inner surface of the reservoir (9) is arc-shaped.

6. The multifunctional double-chamber air bag cervical dilator for clinical obstetrics and gynecology department according to claim 1, wherein a second spring (17) is sleeved on the surface of the inserted rod (16), and two ends of the second spring (17) are respectively abutted against the inner wall of the movable groove and the bottom surface of the transmission ring (18).

7. The multifunctional double-chamber air bag cervical dilator for clinical obstetrics and gynecology department of claim 1, wherein the adjusting mechanism comprises a first contact piece (19), the inside of the transmission ring (18) is inserted with the first contact piece (19), the surface sleeve of the first contact piece (19) is provided with a second contact piece (20), the surface sleeve of the second contact piece (20) is provided with a third contact piece (21), the top surface fixedly connected with transmission rod (22) of the transmission ring (18), the top end of the transmission rod (22) passes through the dilator main rod (1) and extends to the outside of the dilator main rod (1), the surface fixedly connected with adjusting rod (23) of the third contact piece (21), the surface sleeve of the adjusting rod (23) is provided with an extending rod (24), the top surface of the dilator main rod (1) is provided with a circular arc-shaped notch, the top end of the extension rod (24) passes through a circular arc-shaped notch formed in the top surface of the main expander rod (1) and extends to the outside of the main expander rod (1).

8. The multifunctional double-chamber air sac cervical dilator for clinical obstetrics and gynecology department according to claim 1, wherein the top end of the piston rod (14) is provided with a groove, and the edge of the inner surface of the groove is a circular arc surface.

9. The multifunctional double-chamber air bag cervical dilator for clinical obstetrics and gynecology department according to claim 1, wherein the air storage bin (27) is internally and symmetrically and fixedly connected with a limiting plate (13), and the top surface of the limiting plate (13) is abutted against the bottom end of the piston rod (14).

10. The multifunctional double-cavity air bag cervical dilator for clinical obstetrics and gynecology department according to claim 1, wherein the inner surface of the elastic hollow bag (2) is attached to the surface of the dilator main rod (1), and the maximum outer diameter of the elastic hollow bag (2) is smaller than the maximum outer diameter of the dilator main rod (1).

Technical Field

The invention relates to the technical field of medical appliances, in particular to a multifunctional double-cavity air bag cervical dilator for clinical obstetrics and gynecology department.

Background

The cervical dilator is a common instrument for examining the cervix by a gynecologist, the situation of the cervical orifice can be clearly seen after the dilator similar to a duckbill shape props open the vagina, the cervical dilator is used for examining the diagnosis or treatment of cervical erosion and inflammation, and people hope to help the dilator.

However, the cervical dilator cannot properly adjust the dilating diameter during use, repeated training cannot be performed, the skin in the uterus may be torn, meanwhile, due to the use of the dilator, a user may be accompanied by discharge of secretion, the secretion is too slippery, the dilator may be forced to be dislocated from the cervix under the condition of muscle contraction, and if medication is needed in the process of using the dilator, the dilator needs to be removed, and the medication is troublesome to use.

Disclosure of Invention

Solves the technical problem

Aiming at the defects in the prior art, the invention provides a multifunctional double-cavity air sac cervical dilator for clinical use in obstetrics and gynecology department, which solves the problems that the outward expansion of the existing cervical dilator is inconvenient to control and can not be repeatedly trained when in use, the cervical dilator is dislocated because the secretion in the cervix of a user is matched with the contraction of the muscle in the cervix when in use, and the cervical dilator is inconvenient to take down when in use.

Technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

the utility model provides a clinical multi-functional two-chamber gasbag cervical dilator of using of gynaecology and obstetrics, includes the expander mobile jib, the surface veneer of expander mobile jib has elasticity empty bag, the surface mounting of expander mobile jib has fixed establishment, imbibition liquid injection mechanism is installed at the top of expander mobile jib, the inside of expander mobile jib is annular equidistance fixedly connected with gas storage bin, the surface symmetry of gas storage bin articulates there is the piston piece, the cover is equipped with torque spring on the articulated shaft that piston piece and gas storage bin articulated mutually, torque spring's both ends are connected with gas storage bin, piston piece respectively, the top of gas storage bin is inserted and is equipped with the piston rod, the surface cover of piston rod is equipped with first spring, the bottom of first spring is connected with the fixed surface of piston rod, the top of first spring and the inside top surface fixed connection of gas storage bin, the movable groove has been seted up to the inside of expander mobile jib, the expander main rod is inserted through the movable groove that inside was seted up and is equipped with the inserted bar, the inside of expander main rod is inserted and is equipped with the drive ring, the one end of drive ring extends to the movable groove inside and is connected with the top of inserted bar, the inside of expander main rod passes through adjustment mechanism and links to each other with the transfer line, the top fixedly connected with push pedal of transfer line, the surperficial symmetry fixedly connected with of expander main rod is put forth the power piece.

Further, fixed establishment is including solid fixed ring, the surface cover of expander mobile jib is equipped with solid fixed ring, gu fixed ring's fixed surface is connected with the locking ring, the equal fixedly connected with locking block in both ends of locking ring, the surface of locking block runs through the bearing and inserts and be equipped with the locking lever, the one end of locking lever runs through the locking block through the screw thread, the surperficial symmetry fixedly connected with connecting block of locking ring, the one end that the connecting block was kept away from each other all is connected with the rubber gasket through the pivot.

Furthermore, the surface of the rubber gasket is provided with an arc-shaped groove, and the surface of the rubber gasket is provided with anti-skid lines.

Further, liquid mechanism is annotated to imbibition includes the reservoir, the top of expander mobile jib is inserted through the screw and is equipped with the reservoir, the top of reservoir articulates there is the piston plate, the cover is equipped with torque spring on piston plate and the articulated shaft of reservoir looks articulated, torque spring's both ends are connected with reservoir, piston plate respectively, the spout has been seted up to the top surface of piston plate, the spout sliding connection that the piston plate was seted up through the top surface has the locking piece, the internal surface of reservoir is seted up flutedly, the one end of locking piece is inserted and is established in the recess that the reservoir internal surface was seted up.

Furthermore, one end of the locking piece close to the inner wall of the liquid storage bag is arc-shaped, and the opening of the groove formed in the inner surface of the liquid storage bag is arc-shaped.

Furthermore, the surface of the inserted bar is sleeved with a second spring, and two ends of the second spring respectively abut against the inner wall of the movable groove and the bottom surface of the transmission ring.

Further, adjustment mechanism includes first piece that supports, the inside of transmission ring is run through and is inserted and be equipped with first piece that supports, the surface cover of first piece that supports is equipped with the second and supports the piece, the surface cover that the second supported the piece is equipped with the third and supports the piece, the top surface fixedly connected with transfer line of transmission ring, the top of transfer line is passed the outside that the expander mobile jib extends to the expander mobile jib, the third supports the fixed surface of piece and is connected with the regulation pole, the surface cover of adjusting the pole is equipped with the extension rod, convex notch has been seted up to the top surface of expander mobile jib, the top of extension rod is passed the convex notch that the expander mobile jib top surface was seted up and is extended to the outside of expander mobile jib.

Furthermore, the top end of the piston rod is provided with a groove, and the edge of the inner surface of the groove is an arc surface.

Furthermore, limiting plates are symmetrically and fixedly connected inside the gas storage bin, and the top surfaces of the limiting plates are abutted against the bottom end of the piston rod.

Furthermore, the inner surface of the elastic hollow bag is attached to the surface of the main rod of the dilator, and the maximum outer diameter of the elastic hollow bag is smaller than that of the main rod of the dilator.

Advantageous effects

Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:

1. when the liquid injection device is used, liquid can be discharged from the inside of the cervix according to the actual operation requirement, so that the situation that the dilator slides in a staggered manner due to more secretions in the cervix is avoided, and meanwhile, the partial structure can be used as the liquid injection device, so that the inconvenience in operation caused by the fact that a user needs to inject medicines into the inside of the cervix when using the cervix dilator is avoided;

2. when the dilator is used, the part can be seated at the bottom of the buttocks, and the part is fixed by the gravity of the buttocks, so that the dilator connected with the part is fixed due to the limitation of the part, and the conditions of sliding dislocation and the like of the dilator caused by secretions in the cervix of a user are prevented;

3. the cervical dilator is different from the old cervical dilator, can perform multi-gear cervical dilation, and can automatically reset in the dilation process, so that the cervix is elastically trained through repeated dilation and contraction, and a better auxiliary effect is brought to the later fertility or abortion operation of a user.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic perspective view of a multifunctional double-chamber balloon cervical dilator for gynecological clinical use;

FIG. 2 is an enlarged view of a portion of FIG. 1A according to an embodiment of the present invention;

fig. 3 is a schematic structural view of an inner core of a cervical dilator in an embodiment of the invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at B in accordance with an embodiment of the present invention;

FIG. 5 is a schematic diagram of an independent structure of the gas storage silo according to the embodiment of the invention;

FIG. 6 is a schematic diagram of the independent structure of the main shaft of the dilator in an embodiment of the present invention;

the reference numerals in the drawings denote: 1. a main dilator rod; 2. an elastic empty bag; 3. a fixing ring; 4. a locking ring; 5. a locking block; 6. a locking lever; 7. connecting blocks; 8. a rubber gasket; 9. a reservoir; 10. a piston plate; 11. a locking member; 12. a piston member; 13. a limiting plate; 14. a piston rod; 15. a first spring; 16. inserting a rod; 17. a second spring; 18. a drive ring; 19. a first contact member; 20. a second contact member; 21. a third contact member; 22. a transmission rod; 23. adjusting a rod; 24. an extension rod; 25. pushing the plate; 26. a force application block; 27. a gas storage bin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be further described with reference to the following examples.

Example 1

The multifunctional double-cavity air bag cervical dilator for clinical obstetrics and gynecology department of the embodiment is shown in fig. 1, and comprises a dilator main rod 1, wherein an elastic empty bag 2 is glued on the surface of the dilator main rod 1, a fixing mechanism is arranged on the surface of the dilator main rod 1, a liquid suction and injection mechanism is arranged on the top of the dilator main rod 1, an air storage bin 27 is fixedly connected to the inside of the dilator main rod 1 in an annular equidistant manner, piston members 12 are symmetrically hinged to the surface of the air storage bin 27, a torsion spring is sleeved on a hinged shaft of the piston members 12 and the air storage bin 27, and two ends of the torsion spring are respectively connected with the air storage bin 27 and the piston members 12;

as shown in fig. 1, a piston rod 14 is inserted at the top end of the gas storage 27, a first spring 15 is sleeved on the surface of the piston rod 14, the bottom end of the first spring 15 is fixedly connected with the surface of the piston rod 14, the top end of the first spring 15 is fixedly connected with the inner top surface of the gas storage 27, a movable groove is formed in the expander main rod 1, an insertion rod 16 is inserted into the expander main rod 1 through the movable groove formed in the expander main rod 1, a transmission ring 18 is inserted into the expander main rod 1, one end of the transmission ring 18 extends into the movable groove and is connected with the top end of the insertion rod 16, the inside of the expander main rod 1 is connected with a transmission rod 22 through an adjusting mechanism, a push plate 25 is fixedly connected at the top end of the transmission rod 22, and a force block 26 is fixedly connected with the surface symmetry of the expander main rod 1.

When the dilator is used in the embodiment, a user can insert the dilator main rod 1 into the cervix from the vagina, then the index finger and the middle finger are clamped on the surface of the dilator main rod 1 to enable the fingers to be abutted against the surface of the force application block 26, then the thumb is used for pushing the push plate 25, the push plate 25 is pushed by acting force to extend into the dilator main rod 1 from the transmission rod 22, so that the transmission ring 18 connected with the push plate 18 is pushed by acting force to extend into the air storage bin 27 in the dilator main rod 1, and meanwhile, the first spring 15 on the surface of the piston rod 14 is stretched to generate stretching deformation;

along with the stretching into of piston rod 14, adjust the pole 23 and be driven and stretch out from the inside of extension rod 24, the whole extension, the inside gas of gas storage bin 27 forces piston spare 12 to rotate along its articulated shaft that links to each other with gas storage bin 27 and opens, the inside air of gas storage bin 27 is discharged and is injected into between expander mobile jib 1 and the elasticity empty bag 2, the whole diameter of this expander is propped greatly, each subassembly will be because of the resilience force automatic re-setting of first spring 15 when the user removes the power whenever, user's the push pedal 25 that promotes repeatedly, will bring a better air expansion training effect.

Example 2

As shown in fig. 1, the fixing mechanism includes solid fixed ring 3, the surface cover of expander mobile jib 1 is equipped with solid fixed ring 3, gu fixed ring 3's fixed surface is connected with locking ring 4, the equal fixedly connected with locking block 5 in both ends of locking ring 4, the surface of locking block 5 runs through the bearing and is equipped with locking lever 6, the one end of locking lever 6 runs through locking block 5 through the screw thread, the surperficial symmetry fixedly connected with connecting block 7 of locking ring 4, the one end that connecting block 7 kept away from each other all is connected with rubber gasket 8 through the pivot.

When the dilator is used, a user can insert the end of the main rod 1 of the dilator into the cervix, then the rubber gasket 8 is seated under the hip, and the rubber gasket 8 rotates along the hinged shaft hinged with the connecting block 7 to reach an angle matched with the sitting posture of the user;

by the method, a comfortable cushion is provided for a user when the dilator is used, and meanwhile, a certain limiting and fixing effect is brought to the main rod 1 of the dilator by the cushion, so that the main rod 1 of the dilator is prevented from being dislocated or sliding due to wet and slippery of endocrine in cervix of the user;

when the user does not use, the user only needs to rotate the locking rod 6, the locking rod 6 enables the two groups of locking blocks 5 to be away from each other through the thread effect, the purpose of increasing the inner diameter is finally achieved, and at the moment, the user can easily take down the rubber gasket 8 and the connected group from the surface of the main rod 1 of the dilator.

As shown in fig. 1, the surface of the rubber gasket 8 is provided with an arc-shaped groove, and the surface of the rubber gasket 8 is provided with anti-slip lines.

The setting of this partial structure can make the user sit in 8 surfaces of rubber gasket, and the buttock is laminated with 8 surfaces of rubber gasket more, and the antiskid line can effectually prevent that buttock interval rubber gasket 8 from appearing in the gliding condition of the face of placing of rubber gasket 8.

As shown in fig. 1 and 2, the liquid suction and injection mechanism comprises a liquid storage bag 9, the liquid storage bag 9 is inserted into the top end of the main rod 1 of the expander through threads, a piston plate 10 is hinged to the top of the liquid storage bag 9, a torsion spring is sleeved on a hinge shaft formed by hinging the piston plate 10 and the liquid storage bag 9, two ends of the torsion spring are respectively connected with the liquid storage bag 9 and the piston plate 10, a sliding groove is formed in the top surface of the piston plate 10, the piston plate 10 is connected with a locking piece 11 through the sliding groove formed in the top surface, a groove is formed in the inner surface of the liquid storage bag 9, and one end of the locking piece 11 is inserted into the groove formed in the inner surface of the liquid storage bag 9.

When the device is used, a user can push the piston plate 10 to rotate and open along a hinged shaft hinged with the liquid storage bag 9, liquid medicine is injected into the liquid storage bag 9 at the opening, after the piston plate 10 is reset through the acting force of the torsion spring, the user can press the outer surface of the liquid storage bag 9, the liquid medicine in the liquid storage bag 9 is extruded from the perforation in the main rod 1 of the dilator and sent into the cervix, when the user removes the force, the rebound resilience of the liquid storage bag 9 forces the piston plate 10 to open and suck air from the outside, and a space which is excessive due to liquid medicine loss is filled so as to facilitate the subsequent operation of extruding the liquid storage bag 9 to inject medicine;

meanwhile, the partial structure can be used for absorbing and removing the excessive secretion in the cervix, and the same principle is carried out as above.

As shown in fig. 3, one end of the locking piece 11 close to the inner wall of the reservoir 9 is arc-shaped, and the opening of the groove formed on the inner surface of the reservoir 9 is arc-shaped.

This structure makes locking piece 11 more smooth and easy when embedding the recess that the reservoir 9 internal surface was seted up, prevents that the little deformation of part from influencing locking piece 11 and inserting reservoir 9 internal surface and seting up the recess difficulty.

As shown in fig. 3, the surface of the insertion rod 16 is sleeved with a second spring 17, and two ends of the second spring 17 respectively abut against the inner wall of the movable groove and the bottom surface of the transmission ring 18.

The partial structure is used as a component for assisting the first spring 15, and can play a role of sharing the action force for the first spring 15, the force of the component needing to be reset, such as the piston rod 14, is more sufficient, and therefore the load of the first spring 15 is reduced, and the durability of the internal structure of the dilator is enhanced.

Example 3

As shown in fig. 4, adjustment mechanism includes first piece 19 that supports, the inside of transmission ring 18 is run through and is inserted and be equipped with first piece 19 that supports, the surface cover of first piece 19 is equipped with second piece 20 that supports, the surface cover of second piece 20 is equipped with third piece 21 that supports, the top surface fixedly connected with transfer line 22 of transmission ring 18, the top of transfer line 22 is passed the outside that expander mobile jib 1 extends to expander mobile jib 1, the fixed surface of third piece 21 that supports is connected with adjusts pole 23, the surface cover of adjusting pole 23 is equipped with extension rod 24, circular arc notch has been seted up to the top surface of expander mobile jib 1, the circular arc notch that the top of extension rod 24 was seted up through expander mobile jib 1 top surface extends to the outside of expander mobile jib 1.

The user can stir extension rod 24 and drive regulation pole 23 and slide along circular arc notch to adjust pole 23 then can drive third support contact 21, second support contact 20 expands gradually on first support contact 19's surface, along with the subassembly that the three constitutes expands, more multiunit's piston rod 14 can obtain the transmission, thereby be used for filling the air capacity increase between expander mobile jib 1 and the elasticity empty bag 2, consequently this partial structure provides the expansion regulation of a multi-gear selection for the user when the operation, so that bring bigger facility and adaptation for the user when using.

As shown in fig. 4, the top end of the piston rod 14 is provided with a groove, and the edge of the inner surface of the groove is a circular arc surface.

The partial structure is used for identifying gears during gear adjustment in the adjusting mechanism, and a user can identify the currently used gear according to the arrangement of the groove, so that the dilator is more humanized when in use.

As shown in fig. 5, the air storage 27 is symmetrically and fixedly connected with a limiting plate 13, and the top surface of the limiting plate 13 abuts against the bottom end of the piston rod 14.

This part of the structure gives a certain limit to the interaction span of the piston rod 14, preventing it from crossing the position of the piston element 12 during the activity, reducing the effect of the piston rod 14 on the air conduction inside the air reservoir 27.

As shown in figure 1, the inner surface of the elastic hollow bag 2 is attached to the surface of the main dilator rod 1, and the maximum outer diameter of the elastic hollow bag 2 is smaller than that of the main dilator rod 1.

The arrangement can reduce the discomfort of the dilator in the process of inserting from the vagina and extending into the cervix.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.