A device for delaying preterm birth

Abstract

The application discloses a device for delaying premature delivery, which comprises a plurality of split rings arranged in a ring structure in sequence along a circumference, a fixing ring and a connecting piece. Each split ring comprises an upper ring body and a lower ring body, the fixing ring is sleeved on each lower ring body, and the connecting piece is connected to each adjacent two upper ring bodies. The device further comprises a locking structure for locking the position of the upper ring body and the connecting piece, which is arranged between the connecting piece and one upper ring body connected thereto. The locking structure has a plurality of locking positions, and the inner diameter of the ring structure formed by each upper ring body is different at different locking positions. The locking structure can automatically adjust the locking structure to be in different locking positions according to the ligation force. The device can effectively prevent cervical dilatation and thinning, prevent or delay premature delivery, avoid amniotic sac inflammation, and avoid the increase of the ligation force with the increase of the weight of the baby, thereby avoiding the damage to the cervix and the discomfort and pain of the patient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a device for delaying premature birth. BACKGROUND

[0002] Premature birth is one of the most common complications in the perinatal period. At present, the effective measures for premature birth mainly include: (1) the use of progestogen; (2) cervical cerclage; (3) cervical support. Among them, cervical cerclage is the most effective method for treating cervical insufficiency, which means using synthetic suture or synthetic cerclage band to mechanically increase the tensile strength of the cervix, thereby reducing the incidence of perinatal adverse events related to cervical insufficiency. However, cervical cerclage may cause amniotic membrane inflammation, leading to intrauterine inflammation and fetal death in utero, and in severe cases, hysterectomy is required to avoid infection. Secondly, cervical cerclage can cause premature rupture of membranes or dystocia, which has a great impact on the body. Thirdly, cervical cerclage can cause bladder and urethral injury, and also cause cervical laceration.

[0003] Therefore, it is imperative to seek a premature birth prevention and treatment device that has better prevention and treatment effects, better economic benefits, is easy to operate, and is individualized. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a device for delaying premature birth, which can prevent cervical dilation and thinning and prevent or delay premature delivery.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0006] A device for delaying premature birth, comprising a plurality of split rings, the plurality of split rings are sequentially arranged in a circumferential direction to form a ring structure capable of being sleeved on the cervix to perform cerclage on the cervix; the device for delaying premature birth further comprises a fixing ring and a connecting piece for connecting each split ring, each split ring comprises an upper ring body and a lower ring body fixedly arranged at the lower part of the upper ring body, the fixing ring is sleeved on each lower ring body, and the connecting piece is arranged between every two adjacent upper ring bodies and connected to the two adjacent upper ring bodies at both ends thereof; the device for delaying premature birth further comprises a locking structure for locking the relative position between the upper ring body and the connecting piece, the locking structure is arranged at least between one end of the connecting piece and the upper ring body connected thereto; the locking structure has a plurality of locking positions, when the locking structure is at different locking positions, the inner diameters of the ring structures formed by each upper ring body are different, and the locking structure can automatically adjust the locking structure to be at different locking positions according to the stress at the cerclage position.

[0007] In some embodiments, the upper ring body is provided with a receiving groove, the connecting member has a connecting portion connected with the upper ring body, the connecting portion is capable of extending into the receiving groove and moving along the length direction of the receiving groove, the locking structure comprises a plurality of first teeth sequentially arranged on the connecting portion along the length direction of the connecting portion and a second tooth arranged in the receiving groove, the second tooth is capable of being engaged with each of the first teeth, and the tooth height of each of the first teeth gradually increases from the outlet of the receiving groove to the inside of the receiving groove.

[0008] In some embodiments, the second tooth is arranged at the outlet of the receiving groove.

[0009] In some embodiments, each of the first teeth has oppositely arranged first and second tooth surfaces, the first tooth surface faces away from the outlet side of the receiving groove, and the first tooth surface is an inclined surface; the second tooth has oppositely arranged third and fourth tooth surfaces, the third tooth surface faces the outlet side of the receiving groove, and the third tooth surface is an inclined surface; and the third tooth surface is matched with the first tooth surface.

[0010] In some embodiments, each of the first teeth is arranged on the upper and lower sides of the connecting portion along the length direction of the connecting portion, and correspondingly, the second tooth is arranged on the upper and lower sides of the receiving groove.

[0011] In some embodiments, both end portions of the connecting member are connected and locked with the corresponding upper ring body through the locking structure.

[0012] Alternatively, one end portion of the connecting member is connected and locked with the corresponding upper ring body through the locking structure, and the other end portion of the connecting member is fixedly connected with the upper ring body or integrally arranged with the upper ring body.

[0013] In some embodiments, each of the split ring is provided with an anchoring portion for anchoring the preterm delivery delaying device on the cervix, and the anchoring portion is inwardly convex from the inner circumferential surface of the split ring.

[0014] In some embodiments, the anchoring portion is arranged on each of the upper ring body and the lower ring body, and is inwardly convex from the inner circumferential surface of the upper ring body and the inner circumferential surface of the lower ring body, respectively.

[0015] In some embodiments, each of the lower ring body is provided with a clamping groove penetrating through the opposite two sides of the lower ring body in the circumferential direction, and the fixing ring is embedded in each of the clamping grooves.

[0016] In some embodiments, each of the upper ring body is provided with an inclined surface which is inclined from the upper end surface downwardly from the outside to the inside, and the inclined surface extends inwardly to the inner circumferential surface of the upper ring body.

[0017] In some embodiments, the delayed preterm birth device has a closed state. When the delayed preterm birth device is in the closed state, adjacent sides of two adjacent upper ring bodies abut against each other. The annular structure formed by the upper ring bodies and the annular structure formed by the lower ring bodies are both columnar. In each of the segmented rings, the length of the upper ring body in the circumferential direction is greater than the length of the lower ring body in the circumferential direction, such that when the delayed preterm birth device is in the closed state, there is a gap between adjacent sides of two adjacent lower ring bodies.

[0018] In some embodiments, in each of the segmented rings, the upper ring body and the lower ring body are integrally disposed.

[0019] In some embodiments, each of the segmented rings, the retaining rings, and the connectors is made of an elastic material.

[0020] Due to the application of the above technical solution, the device for delaying premature birth of the present invention has the following advantages compared with the prior art:

[0021] (1) The present invention uses a non-invasive method to cervically ligate the cervix, which can effectively prevent cervical dilation and thinning and prevent or delay premature delivery, and can also avoid amniotic sac inflammation.

[0022] (2) The inner diameter of the ring structure for cervical ligation in this invention can gradually increase as the baby gets heavier, so that the ligation force on the cervix can always be kept at a relatively stable value, which can avoid the ligation force from increasing as the baby gets heavier, thereby damaging the cervix and causing discomfort and pain to the patient.

[0023] (3) The present invention has a simple structure and is easy to operate. Attached Figure Description

[0024] Appendix Figure 1 This is a three-dimensional schematic diagram of the delayed preterm birth device in this embodiment (the delayed preterm birth device is in a loose state).

[0025] Appendix Figure 2 This is a three-dimensional schematic diagram of the delayed preterm birth device in this embodiment (the delayed preterm birth device is in a closed state).

[0026] Appendix Figure 3 This is a front view schematic diagram of the delayed preterm birth device in this embodiment;

[0027] Appendix Figure 4 This is a cross-sectional schematic diagram of the delayed preterm birth device in this embodiment;

[0028] Appendix Figure 5A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0029] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 6 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 5 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0030] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 7 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 5 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0031] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 8 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 5 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0032] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 9 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 5 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0033] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 10 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 5 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0034] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 11 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0035] A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ; Figure 12 A perspective view of the connection of two adjacent split rings of the embodiment by the connecting piece (one end of the connecting piece is connected with the upper ring body by the locking structure) ;

[0036] 1, split ring; 1a, first split ring; 1b, second split ring; 11, upper ring body; 111, accommodating groove; 112, second tooth; 1121, third tooth surface; 1122, fourth tooth surface; 113, inclined surface; 12, lower ring body; 121, clamping groove; 13, anchoring portion; 2, fixing ring; 3, connecting piece; 31, connecting portion; 311, first tooth; 3111, first tooth surface; 3112, second tooth surface. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, such as Figure 3 In the drawings, the left direction is "left", the right direction is "right", the upper direction is "up", and the lower direction is "down", and the direction perpendicular to the paper in the drawings is "front" and "back", which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] As shown in Figures 1-4 The premature delivery delaying device of the present application comprises a plurality of split rings 1, which are sequentially arranged in a circumferential direction to form a ring structure capable of being sleeved on the cervix to cerclage the cervix, thereby preventing the cervix from dilating and thinning and preventing or delaying premature delivery. Since the non-invasive cerclage method is adopted, the amniotic sac can be prevented from inflammation.

[0040] As shown in Figures 1-4 The premature delivery delaying device further comprises a fixing ring 2 and a connecting piece 3, both of which are used to connect the split rings 1.

[0041] Specifically, each split ring 1 comprises an upper ring body 11 and a lower ring body 12 fixedly arranged at the lower part of the upper ring body 1. The fixing ring 2 is sleeved on each lower ring body 12 to connect the lower ring bodies 12 through the fixing ring 2, so that the lower ring bodies 12 form a ring structure. The connecting piece 3 is arranged between two adjacent upper ring bodies 11 and connected to the two adjacent upper ring bodies 11 at both ends, so that the upper ring bodies 11 also form a ring structure through the connecting piece 3. In this embodiment, the upper ring body 11 and the lower ring body 12 are integrally arranged, which makes the forming process of the split ring 1 simple.

[0042] The premature delivery delaying device further comprises a locking structure for locking the relative position between the upper ring body 11 and the connecting piece 3, so that the ring structure formed by the upper ring bodies 11 is stable to effectively cerclage the cervix.

[0043] The locking structure has a plurality of locking positions, and when the locking structure is at different locking positions, the inner diameters of the ring structures formed by the upper ring bodies 11 are different, so that the cerclage forces on the cervix are different. The locking structure can automatically adjust the locking structure to be at different locking positions according to the size of the cerclage force, that is, the inner diameters of the ring structures formed by the upper ring bodies 11 are different.

[0044] Thus, when the cervix is cerclaged by the device for delaying preterm birth, if the inner diameter of the ring structure formed by the upper ring bodies 11 remains unchanged as the baby's weight gradually increases, the force on the cerclaged cervix will gradually increase, which can cause cervical injury or discomfort to the patient. When the locking structure automatically adjusts the locking position according to the cerclage force, the inner diameter of the ring structure formed by the upper ring bodies 11 gradually increases as the baby's weight increases, so that the cerclage force of the device for delaying preterm birth on the cervix remains at a relatively stable force value, which can avoid the cerclage force damaging the cervix and causing discomfort and pain to the patient as the baby gets heavier.

[0045] As shown in Figures 5-12 The upper ring body 11 is provided with a receiving groove 111, and the connecting member 3 has a connecting portion 31 connected with the upper ring body 11. The connecting portion 31 can extend into the receiving groove 111 and can move along the length direction of the receiving groove 111. The locking structure includes first teeth 311 and second teeth 112. The first teeth 311 are sequentially arranged on the connecting portion 31 along the length direction of the connecting portion 31, and the second teeth 112 can be respectively engaged with the first teeth 311. When the second teeth 112 are engaged with different first teeth 311, the locking structure is in different locking positions. The height of each first tooth 311 gradually increases from the outlet of the receiving groove 111 to the inside direction along the extension direction of the receiving groove 111.

[0046] Thus, when the cervix is cerclaged by the device for delaying preterm birth, if the inner diameter of the ring structure formed by the upper ring bodies 11 remains unchanged as the baby's weight gradually increases, the force on the cerclaged cervix will gradually increase, which can cause cervical injury or discomfort to the patient. When the locking structure automatically adjusts the locking position according to the cerclage force, the inner diameter of the ring structure formed by the upper ring bodies 11 gradually increases as the baby's weight increases, so that the cerclage force of the device for delaying preterm birth on the cervix remains at a relatively stable force value, which can avoid the cerclage force damaging the cervix and causing discomfort and pain to the patient as the baby gets heavier.

[0047] Each first tooth 311 has oppositely arranged first and second tooth surfaces 3111 and 3112, and the first tooth surface 3111 faces away from the outlet side of the receiving groove 111. The second tooth 112 has oppositely arranged third and fourth tooth surfaces 1121 and 1122, and the third tooth surface 1121 faces the outlet side of the receiving groove 111.

[0048] The first tooth surface 3111 is an inclined surface, and the third tooth surface 1121 is also an inclined surface, and the third tooth surface 1121 is matched with the first tooth surface 3111. In this way, when the clamping device is clamped to move the connecting part 31 in the direction of inserting into the containing groove 111, the third tooth surface 1121 is matched with the first tooth surface 3111, so that the connecting part 31 can be easily inserted into the containing groove 111, thereby connecting the adjacent two upper ring bodies 11 through the connecting piece 3, and the annular structure formed by the upper ring bodies 11 can be contracted.

[0049] The second tooth surface 3112 and the fourth tooth surface 1122 are both straight surfaces, and the locking structure is in a locked state by abutting the second tooth surface 3112 and the fourth tooth surface 1122.

[0050] Preferably, the second tooth 112 is arranged at the outlet of the containing groove 111. In this way, more first teeth 311 can be designed, and the locking structure has more locking positions, so that the cerclage force for cerclage of the cervix can be better adjusted.

[0051] The first teeth 311 are respectively arranged on the upper and lower sides of the connecting part 31 along the length direction of the connecting part 31, and correspondingly, the second teeth 112 are arranged on the upper and lower sides of the containing groove 111. This makes the force between the upper ring body 11 and the connecting piece 3 balanced, and can avoid the problem that the connecting piece 3 is twisted and the locking position of the locking structure cannot be automatically adjusted according to the weight of the baby.

[0052] The locking structure is arranged at least between one end of the connecting piece 3 and the upper ring body 11 connected thereto.

[0053] In one embodiment, as shown in Figures 5-10 , one end of the connecting piece 3 is connected and locked with the corresponding upper ring body 11 through the locking structure, and the other end of the connecting piece 3 is fixedly connected to the upper ring body 11 or integrally arranged with the upper ring body 11. In this way, the upper ring bodies 11 of the adjacent two split ring halves 1 need to be designed as different structures, which are respectively a first split ring half 1a and a second split ring half 1b. At this time, the total number of the split ring halves 1 is even, the number of the first split ring half 1a and the second split ring half 1b is the same, and they are arranged in a circumferential direction.

[0054] In another embodiment, as shown in Figure 11 and Figure 12 , both ends of the connecting piece 3 are connected and locked with the corresponding upper ring body 11 through the locking structure. In this way, the structure of each split ring half 1 is the same, and the number of the split ring halves 1 is not limited. In this way, the processing technology of the device for delaying premature birth is simple, and when the inner diameter of the annular structure formed by the upper ring body 11 increases with the increase of the weight of the baby, the two ends of the connecting piece 3 are simultaneously pulled out of the containing groove 111, the response speed is faster, and the distribution of the cerclage force for the cervix is more uniform.

[0055] As shown in Figure 1 and Figure 2 , each split ring 1 is provided with an anchoring portion 13, through which the delayed preterm birth device can be anchored on the cervix, and the anchoring portion 13 is inwardly convex from the inner circumferential surface of the split ring 1. The positioning effect of the delayed preterm birth device through the anchoring portion 13 is good, which can prevent the delayed preterm birth device from falling off and avoid the problem of ineffective cerclage. Moreover, the positioning mode through the anchoring portion 13 can reduce the contact area with the cervix, which can avoid the problem of local blood circulation disorder at the cerclage of the cervix.

[0056] In this embodiment, the anchoring portion 13 is arranged on each upper ring body 11 and lower ring body 12, respectively, and is inwardly convex from the inner circumferential surface of the upper ring body 11 and the inner circumferential surface of the lower ring body 12, respectively. In this way, the positioning effect of the delayed preterm birth device is better, and at the same time, the distribution of the cerclage force of the delayed preterm birth device on the cervix is more uniform, so as to improve the cerclage effect of the cervix.

[0057] As shown in Figures 1-12 , each lower ring body 12 is provided with a clamping groove 121 penetrating through the opposite two side surfaces in the circumferential direction of the lower ring body 12, and the fixing ring 2 is embedded in the clamping groove 121. In this way, the fixing ring 3 can be prevented from slipping off the lower ring body 12, so as to avoid the problem that the annular structure formed by the lower ring body 12 is loose and cannot be cerclaged on the cervix.

[0058] As shown in Figure 1 , Figure 2 and Figure 4 , each upper ring body 11 is provided with an inclined surface 113 inclined from the upper end surface downward and from the outside to the inside, the inclined surface 113 extends inwardly to the inner circumferential surface of the upper ring body 111, and the anchoring portion 13 on the upper ring body 11 is not higher than the inclined surface 113. The inclined surface 113 on each upper ring body 11 forms a bearing surface for bearing the baby.

[0059] The delayed preterm birth device has a closed state. As shown in Figure 2 , when the delayed preterm birth device is in the closed state, the adjacent side surfaces of the two adjacent upper ring bodies 11 abut and cooperate, and the annular structure surrounded by the upper ring body 11 and the annular structure surrounded by the lower ring body 12 are both columnar. In each split ring 1, the length of the upper ring body 11 in the circumferential direction is greater than the length of the lower ring body 12 in the circumferential direction, so that when the delayed preterm birth device is in the closed state, there is a spacing distance between the adjacent side surfaces of the two adjacent lower ring bodies 12.

[0060] In this way, when the inner diameter of the ring structure formed by the upper ring bodies 11 gradually increases, the spacing distance between the adjacent two lower ring bodies 12 decreases, so that the lower ring bodies 12 do not cause large resistance to the outward expansion of the upper ring bodies 11. After the inner diameter of the ring structure formed by the upper ring bodies 11 gradually increases from the closed state, the premature birth delaying device forms a conical structure with the upper large and the lower small.

[0061] In this embodiment, each split ring 1, the fixed ring 2 and the connecting piece 3 are made of elastic material. For example, each split ring 1, the fixed ring 2 and the connecting piece 3 can be made of silica gel.

[0062] The operation method of the premature birth delaying device when performing cervical cerclage is as follows:

[0063] (1) First, use a speculum to open the vagina and expose the cervix.

[0064] (2) Use a cervical clamp to hold the cervix and set the premature birth delaying device in a loose state on the cervix.

[0065] (3) Compress the premature birth delaying device through the clamp, so that the premature birth delaying device in a loose state is shrunk to a closed state, thereby clamping the cervix. When the baby gradually becomes heavier, the force on the cervix due to cerclage becomes larger. At this time, the previous first tooth 311 engaged with the second tooth 112 in the premature birth delaying device cannot withstand the larger cerclage force and automatically collapses to the next first tooth 311 engaged with the second tooth 112, so that the force at the cerclage always remains at a relatively stable force value.

[0066] (4) When the baby is full-term, directly cut off the fixed ring 2 and / or the connecting piece 3, and take out the premature birth delaying device.

[0067] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A device for delaying preterm labor, characterized by: The device comprises a plurality of split rings arranged in sequence along the circumference to form a ring structure capable of being fitted on the cervix for cerclage; the device further comprises a fixing ring and a connecting piece for connecting each split ring, each split ring comprises an upper ring body and a lower ring body fixedly arranged at the lower part of the upper ring body, the fixing ring is fitted on each lower ring body, and the connecting piece is arranged between every two adjacent upper ring bodies and connected to the two adjacent upper ring bodies at both ends; the device further comprises a locking structure for locking the relative position between the upper ring body and the connecting piece, the locking structure is arranged at least between one end of the connecting piece and the upper ring body connected thereto; the locking structure has a plurality of locking positions, when the locking structure is at different locking positions, the inner diameter of the ring structure formed by each upper ring body is different, and the locking structure can be automatically adjusted according to the stress at the cerclage to be at different locking positions, when the inner diameter of the ring structure formed by each upper ring body gradually increases, the spacing distance between two adjacent lower ring bodies decreases; The upper ring body is provided with a receiving groove, the connecting piece has a connecting part connected to the upper ring body, the connecting part can extend into the receiving groove and move along the length direction of the receiving groove, the locking structure comprises a plurality of first teeth arranged in sequence on the connecting part along the length direction of the connecting part and a second tooth arranged in the receiving groove, and the second tooth can be clamped with each first tooth; the tooth height of each first tooth gradually increases from the outlet to the inside of the receiving groove along the extension direction of the receiving groove; The second tooth is arranged at the outlet of the receiving groove.

2. The device of claim 1, wherein: Each first tooth has oppositely arranged first and second tooth surfaces, the first tooth surface faces away from the outlet side of the receiving groove, and the first tooth surface is an inclined surface; the second tooth has oppositely arranged third and fourth tooth surfaces, the third tooth surface faces toward the outlet side of the receiving groove, and the third tooth surface is an inclined surface; the third tooth surface is matched with the first tooth surface.

3. The device of claim 1, wherein: The first teeth are respectively arranged on the upper and lower sides of the connecting part along the length direction of the connecting part, and correspondingly, the second teeth are arranged on the upper and lower sides of the receiving groove.

4. The device of any one of claims 1 to 3, wherein: Both end parts of the connecting piece are connected and locked to the corresponding upper ring body through the locking structure.

5. The device of any one of claims 1 to 3, wherein: One end part of the connecting piece is connected and locked to the corresponding upper ring body through the locking structure, and the other end part of the connecting piece is fixedly connected to the upper ring body or integrally arranged with the upper ring body.

6. The device of claim 1, wherein: Each split ring is provided with an anchoring part for anchoring the device on the cervix, and the anchoring part is inwardly convex from the inner circumferential surface of the split ring.

7. The device of claim 6, wherein: The anchoring parts are respectively arranged on each upper ring body and lower ring body and are inwardly convex from the inner circumferential surface of the upper ring body and the inner circumferential surface of the lower ring body.

8. The device of claim 1, wherein: Each of the lower ring bodies is provided with a clamping groove penetrating through opposite sides in the circumferential direction of the lower ring body, and the fixing ring is embedded in each of the clamping grooves.

9. The device of claim 1, wherein: Each of the upper ring bodies is provided with an inclined surface inclined from the upper end surface downward and from the outside to the inside, and the inclined surface extends inward to the inner circumferential surface of the upper ring body.

10. The device of claim 1, wherein: The device for delaying premature birth has a closed state, when the device for delaying premature birth is in the closed state, adjacent sides of two adjacent upper ring bodies abut and are matched, the annular structure surrounded by the upper ring bodies and the annular structure surrounded by the lower ring bodies are both in a columnar shape; in each of the split ring bodies, the length of the upper ring body in the circumferential direction is greater than the length of the lower ring body in the circumferential direction, so that when the device for delaying premature birth is in the closed state, there is a spacing distance between adjacent sides of two adjacent lower ring bodies.

11. The device of claim 1, wherein: In each of the split ring bodies, the upper ring body and the lower ring body are integrally arranged.

12. The device of claim 1, wherein: Each of the split ring bodies, the fixing ring and the connecting piece are made of an elastic material.

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