Fetal head suction midwifery device for obstetrics and gynecology department

Abstract

The fetal head suction midwifery device for the obstetrics and gynecology department comprises a suction cup, a negative pressure device, a guide ring and at least two clamping arms. The sucker is provided with an adsorption head and a communicating pipe, and the adsorption head and the head of the baby define an adsorption cavity; the negative pressure device is provided with a negative pressure cavity and is communicated with the adsorption cavity through a communicating pipe; when the negative pressure device is axially far away from the sucker along the communicating pipe, negative pressure is formed in the adsorption cavity to adsorb the head; the guide ring is slidably sleeved outside the communicating pipe; one end of the clamping arm is connected with the negative pressure device, and the other end forms a clamping end; when the negative pressure device drives the clamping arm to move towards the negative pressure device, the guide part of the clamping arm is guided by the guide ring to swing, so that the clamping end is folded to clamp the head. The invention aims to solve the problem that the traction action and the clamping action cannot be completed by the same mechanical structure in a linkage manner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fetal head delivery device, and particularly relates to a fetal head suction delivery device for obstetrics. BACKGROUND

[0002] Fetal head suction delivery is a key technology for handling dystocia, and the existing device mainly relies on a negative pressure suction cup to adsorb and pull the fetal head. However, in actual operation, there is a risk of slipping during traction only by suction force, especially when continuous or increased traction force is needed. Although some improved schemes attempt to increase the independent operation of the clamping part to assist fixation, "suction" and "clamping" are two separate operation steps, and integration is not achieved. This split operation makes it impossible for the delivery doctor to automatically and instantly obtain additional mechanical clamping force to enhance fixation and prevent slipping while implementing traction, affecting the efficiency and safety of the operation. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a fetal head suction delivery device for obstetrics, so as to solve the problem that traction action and clamping action cannot be completed by the same mechanical structure.

[0004] The purpose of the present application is achieved by the following technical scheme:

[0005] A fetal head suction delivery device for obstetrics, comprising a suction cup, a negative pressure device, a guide ring and at least two oppositely arranged clamping arms; the suction cup is provided with a suction head and a communication pipe, the suction head and the baby's head jointly enclose a suction cavity, and the communication pipe communicates with the suction cavity; the negative pressure device is provided with a negative pressure cavity in the inside, and the negative pressure cavity communicates with the suction cavity through the communication pipe; when the negative pressure device moves away from the suction cup along the axial direction of the communication pipe, the suction cavity forms a negative pressure to adsorb the baby's head; the guide ring is slidably sleeved on the outside of the communication pipe; one end of each clamping arm close to the negative pressure device is connected with the negative pressure device and can move with the negative pressure device; the other end of the clamping arm away from the negative pressure device forms a clamping end for clamping the baby's head; the middle part of the clamping arm is provided with a guide part, when the negative pressure device drives the clamping arm to move in the direction close to the negative pressure device, the clamping end of each clamping arm swings under the guidance of the guide ring to clamp the baby's head.

[0006] Further, the negative pressure device is provided with a first threaded structure, and the communication pipe is provided with a second threaded structure matched with the first threaded structure, so that the negative pressure device can move along the axial direction of the communication pipe by rotating.

[0007] Further, a dynamic sealing structure for maintaining the airtightness of the communication space between the negative pressure cavity and the suction cavity is arranged between the first threaded structure and the second threaded structure.

[0008] Further, the clamping arm is provided with a sliding key near the end of the negative pressure device, the negative pressure device is provided with a rotating track ring, the rotating track ring is provided with an annular track, and the sliding key is slidably matched in the annular track; when the negative pressure device drives the rotating track ring to rotate, the guide ring restricts the clamping arm, so that the clamping arm cannot rotate with the negative pressure device, and thus the sliding key only relatively slides in the axial direction of the communication pipe in the annular track.

[0009] Further, the two clamping arms are provided with a connecting piece connected with each other.

[0010] Further, the guide ring is made of flexible medical silica gel material.

[0011] Further, the guide ring is in the shape of a truncated conical platform, and the radial dimension of the end of the guide ring near the negative pressure device is smaller than the radial dimension of the end of the guide ring near the suction disc.

[0012] Further, the outer side wall of the guide ring is provided with an anti-skid pattern.

[0013] Further, the adsorption head is made of medical silica gel material, the adsorption head is used for being attached to the outer side of the adsorption surface of the baby's head, and the outer side of the adsorption head is covered with a protective cover.

[0014] Further, the clamping end of the front end of the clamping arm is covered with a flexible buffer layer.

[0015] Compared with the prior art, the beneficial effects of the present application are that:

[0016] 1. Based on the integrated structure of the suction disc, the communication pipe and the negative pressure device, the adsorption cavity is formed by the adsorption head and the baby's head, the negative pressure cavity of the negative pressure device is communicated with the adsorption cavity through the communication pipe, when the negative pressure device moves away from the suction disc along the axial direction of the communication pipe, the linkage increases the volume of the communication space, so that a stable negative pressure is formed in the adsorption cavity to realize reliable adsorption of the baby's head, and a stable initial traction force basis is provided for midwifery.

[0017] 2. Based on the mechanical linkage design of the guide ring and the clamping arm, the proximal ends of at least two oppositely arranged clamping arms are connected with the negative pressure device to move synchronously, the distal end of the clamping arm forms a clamping end, and a guide part matched with the guide ring sleeved on the outside of the communication pipe is arranged on the clamping arm; when the negative pressure device moves and drives the clamping arm to move in the direction thereof, the guide part of each clamping arm is guided by the contour of the fixed guide ring, so that the clamping arm is forced to swing, so that the clamping end is inwardly folded to clamp the baby's head.

[0018] 3、Based on the thread driving structure between the negative pressure device and the communication pipe, and the sliding key and the ring track matching structure between the clamping arm and the negative pressure device, the axial movement of the negative pressure device is realized by thread rotation to generate suction and traction action, and the radial sliding matching of the sliding key in the ring track of the rotating track ring enables the clamping arm to only move axially under the constraint of the guide ring without rotating with the negative pressure device, ensuring that the clamping arm can synchronously perform clamping action during traction. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structure schematic view of a gynecological and obstetric fetal head suction assisted delivery device.

[0020] Figure 2 It is a structure schematic view of another perspective. Figure 1 It is a sectional view of the structure schematic view shown.

[0021] Figure 3 It is an enlarged view of A shown. Figure 2

[0022] In the figure: 1, suction cup; 2, suction head; 3, communication pipe; 4, suction cavity; 5, negative pressure device; 6, negative pressure cavity; 7, guide ring; 8, clamping arm; 9, clamping end; 10, first thread structure; 11, second thread structure; 12, sliding key; 13, rotating track ring; 14, ring track; 15, connecting piece; 16, anti-skid pattern; 17, protective cover; 18, flexible buffer layer. DETAILED DESCRIPTION

[0023] In the following, the present application will be further described in conjunction with the drawings and specific embodiments, and it should be noted that the following described embodiments or technical features can be combined in any manner to form new embodiments without conflict.

[0024] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right", and similar terms as used herein are for purposes of illustration and description only and are not intended to be limiting.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the term "and / or" includes any and all combinations of one or more of the associated listed items. ​

[0026] Referring to Figures 1-3 , the detailed description of a preferred embodiment of the present application:

[0027] A obstetrical fetal head suction delivery device, comprising a suction cup 1, a negative pressure device 5, a guide ring 7 and at least two oppositely arranged clamping arms 8; the suction cup 1 is provided with a suction head 2 and a communication pipe 3, the suction head 2 and the baby's head together enclose a suction cavity 4, and the communication pipe 3 communicates with the suction cavity 4; the negative pressure device 5 is provided with a negative pressure cavity 6 inside, and the negative pressure cavity 6 communicates with the suction cavity 4 through the communication pipe 3; when the negative pressure device 5 moves away from the suction cup 1 along the axis of the communication pipe 3, the suction cavity 4 forms a negative pressure to suck the baby's head; the guide ring 7 is slidably sleeved on the outside of the communication pipe 3; one end of each clamping arm 8 near the negative pressure device 5 is connected with the negative pressure device 5 and can move with the negative pressure device 5; the other end of the clamping arm 8 away from the negative pressure device 5 forms a clamping end 9 for clamping the baby's head; the middle part of the clamping arm 8 is provided with a guide part, when the negative pressure device 5 drives the clamping arm 8 to move in the direction close to the negative pressure device 5, the clamping end 9 of each clamping arm 8 swings under the guidance of the guide ring 7 to clamp the baby's head. The device provides stable and controllable initial traction force for fetal head delivery by establishing reliable negative pressure suction and synchronous mechanical clamping fixation on the baby's head.

[0028] The device is mainly composed of a suction cup 1, a negative pressure device 5, a guide ring 7 and at least two oppositely arranged clamping arms 8. The suction head 2 at the front end of the suction cup 1 is used to enclose the suction cavity 4 with the baby's head, and the communication pipe 3 communicates with the negative pressure cavity 6 inside the negative pressure device 5; the guide ring 7 is slidably sleeved on the outside of the communication pipe 3; the proximal end of each clamping arm 8 is connected with the negative pressure device 5, and the distal end forms a clamping end 9, and the clamping arm 8 is provided with a guide part matched with the profile of the guide ring 7.

[0029] When the negative pressure device 5 moves away from the suction cup 1 along the axis of the communication pipe 3, the communication space volume between the negative pressure cavity 6 and the suction cavity 4 increases, and a stable negative pressure is formed in the suction cavity 4, thereby suctioning and fixing the baby's head; at the same time, the movement of the negative pressure device 5 drives the clamping arm 8 to move in the same direction, at this time, the fixed guide ring 7 interacts with the guide part on the clamping arm 8 through its profile, forcing each clamping arm 8 to swing inward, and finally making all the clamping ends 9 inwardly close, realizing the cooperative clamping of the baby's head.

[0030] In specific operation, first, the suction head 2 is aligned and attached to the baby's head, then the negative pressure device 5 is started to move away from the suction cup 1 along the axis of the communication pipe 3, at this time, the suction cavity 4 realizes the suction and fixation of the head under the action of negative pressure; with the continuous movement of the negative pressure device 5, the clamping arm 8 connected with it gradually swings inward under the profile guidance of the guide ring 7, so that the clamping end 9 stably closes and contacts the head.

[0031] It can be understood that based on the integrated structure of the suction cup 1, the communication pipe 3 and the negative pressure device 5, the suction cavity 4 is formed by the suction head 2 and the baby's head, the negative pressure cavity 6 of the negative pressure device 5 is communicated with the suction cavity 4 through the communication pipe 3, when the negative pressure device 5 moves axially away from the suction cup 1 along the communication pipe 3, the linkage increases the volume of the communication space, thereby forming a stable negative pressure in the suction cavity 4 to achieve reliable suction of the baby's head, providing a stable initial traction force basis for midwifery. Based on the mechanical linkage design of the guide ring 7 and the clamping arm 8, the proximal end of at least two oppositely arranged clamping arms 8 is connected with the negative pressure device 5 to move synchronously, the distal end of the clamping arm 8 forms a clamping end 9, and a guide part cooperating with the guide ring 7 fixedly sleeved outside the communication pipe 3 is arranged on the clamping arm 8; when the negative pressure device 5 moves and drives the clamping arm 8 to move in the direction thereof, the guide part of each clamping arm 8 is guided by the contour of the fixed guide ring 7, forcing the clamping arm 8 to swing, so that the clamping end 9 is inwardly folded to clamp the baby's head.

[0032] Preferably, the negative pressure device 5 is provided with a first threaded structure 10, and the communication pipe 3 is provided with a second threaded structure 11 matched with the first threaded structure 10, so that the negative pressure device 5 can move axially along the communication pipe 3 by rotation. This structure realizes the axial movement of the negative pressure device 5 through threaded driving, ensuring the synchronization and reliability of the movement of the clamping arm 8 while generating stable negative pressure suction and traction.

[0033] The first threaded structure 10 is arranged inside the negative pressure device 5, and the second threaded structure 11 is correspondingly arranged on the outer wall or inner wall of the communication pipe 3, both of which constitute a precise threaded pair. The threaded pair is the core driving and guiding mechanism for realizing the axial movement of the negative pressure device 5 along the communication pipe 3.

[0034] In operation, by rotating the negative pressure device 5, the first threaded structure 10 of the negative pressure device 5 is screwed on the second threaded structure 11 of the communication pipe 3, thereby driving the whole negative pressure device 5 to move stably axially along the communication pipe 3 away from the suction cup 1. This axial movement directly increases the volume of the communication space between the negative pressure cavity 6 and the suction cavity 4, thereby forming a negative pressure in the suction cavity 4 to suck the baby's head, and providing a controllable axial force for subsequent traction.

[0035] Preferably, a dynamic sealing structure for maintaining the air tightness of the communication space between the negative pressure cavity 6 and the suction cavity 4 is arranged between the first threaded structure 10 and the second threaded structure 11. This structure ensures the axial movement function of the threaded driving of the negative pressure device 5, and at the same time maintains the dynamic air tightness of the communication space between the negative pressure cavity 6 and the suction cavity 4.

[0036] One or more dynamic sealing structures are arranged between the first threaded structure 10 of the negative pressure device 5 and the second threaded structure 11 of the communication pipe 3. The dynamic sealing structure keeps fit with the movement of the threaded pair, but does not limit the relative rotation by itself. The core function of the dynamic sealing structure is to fill the gap between the threaded pair and effectively seal at all times, so as to isolate the air flow channel formed by the threaded connection from the external atmosphere.

[0037] When the negative pressure device 5 moves axially along the communication pipe 3 by threaded rotation, the dynamic sealing structure generates dynamic deformation or sliding friction with the change of the relative position between the negative pressure device 5 and the communication pipe 3. No matter what the axial position of the negative pressure device 5 is, the sealing structure can continuously close the physical gap between the threaded pair, ensuring that the entire sealed space composed of the negative pressure cavity 6, the communication pipe 3 and the adsorption cavity 4 does not leak air, so as to generate and maintain the required negative pressure in the process of increasing the volume of the communication space.

[0038] Preferably, the proximal end of the clamping arm 8 is provided with a sliding key 12, and the negative pressure device 5 is provided with a rotating track ring 13, which is provided with an annular track 14, and the sliding key 12 is slidably fitted in the annular track 14. When the negative pressure device 5 rotates to drive the rotating track ring 13, the guide ring 7 restricts the clamping arm 8 so that the clamping arm 8 cannot rotate with the negative pressure device 5, so that the sliding key 12 only generates axial relative sliding along the communication pipe 3 in the annular track 14. This structure realizes the pure axial translation of the clamping arm 8 during the rotation and traction of the negative pressure device 5, decouples the rotation and clamping functions, and ensures the stability and controllability of the clamping action.

[0039] The proximal end of the clamping arm 8 is provided with a sliding key 12, and the rotating track ring 13 is provided with an annular track 14, and the sliding key 12 is fitted in the annular track 14. The guide ring 7 is sleeved on the outside of the communication pipe 3 and cooperates with the guide portion on the clamping arm 8.

[0040] When the negative pressure device 5 synchronously rotates to drive the rotating track ring 13, the clamping arm 8 constrained by the guide ring 7 cannot follow the rotation. In this state, the rotating movement of the rotating track ring 13 forces the sliding key 12 to slide in the annular track 14 thereof. Since the clamping arm 8 is restricted from rotating, the sliding is converted into the relative displacement between the sliding key 12 and the annular track 14 in the axial direction of the communication pipe 3, thereby driving the entire clamping arm 8 to move only in the axial direction, providing an axial input for the subsequent clamping swing under the action of the guide ring 7.

[0041] It can be understood that, based on the threaded driving structure between the negative pressure device 5 and the communication pipe 3, and the sliding key 12 and annular track 14 matching structure between the clamping arm 8 and the negative pressure device 5, axial movement of the negative pressure device 5 is achieved by threaded rotation to generate suction and traction actions, and at the same time, the radial sliding matching of the sliding key 12 in the annular track 14 of the rotating track ring 13 enables the clamping arm 8 to only move axially under the constraint of the guide ring 7 without rotating with the negative pressure device 5, ensuring that the clamping arm 8 can synchronously perform clamping actions during traction.

[0042] Preferably, the two clamping arms 8 are provided with a connecting piece 15 connected to each other. The connecting piece 15 realizes rigid linkage between the two clamping arms 8, ensuring high synchronism and stability of their actions.

[0043] The two oppositely arranged clamping arms 8 are connected to each other at a specific position by a connecting piece 15, which combines the two originally independent clamping arms 8 into a whole frame structure.

[0044] When either clamping arm 8 has a tendency to swing or move axially under the action of the guide ring 7, the force is directly transmitted to the other clamping arm 8 through the connecting piece 15, forcing the two clamping arms 8 to move in a synchronous manner, thereby ensuring that the two clamping ends 9 can be simultaneously and symmetrically closed or opened, achieving uniform and balanced clamping of the baby's head.

[0045] Preferably, the guide ring 7 is made of flexible medical silicone material. The flexible material enables the operator to manually pinch and fix the guide ring 7, preventing it from following unintended radial rotation when the negative pressure device 5 rotates.

[0046] The guide ring 7 is made of flexible medical silicone material, the inner circle profile of which maintains the structure required for the guiding function, while the outer surface provides friction and flexibility for easy manual gripping.

[0047] When the operator rotates the negative pressure device 5 to generate negative pressure, the outer surface of the guide ring 7 made of flexible silicone material can be pinched by the fingers, and the friction and deformation of the silicone provide stable manual gripping force. This gripping force effectively constrains the guide ring 7, enabling it to overcome the sliding friction with the communication pipe 3 and thus remain stationary without following the rotation of the negative pressure device 5, providing a necessary fixed reference for the stable axial translation of the clamping arm 8.

[0048] Preferably, the guide ring 7 is in the shape of a truncated conical frustum, with the radial dimension of the end close to the negative pressure device 5 being smaller than that of the end close to the suction cup 1. The conical frustum structure is designed to match the natural pinch arc of the human hand, enabling the operator to comfortably and stably hold the guide ring 7 to prevent it from rotating during operation.

[0049] The guide ring 7 is in the shape of a truncated conical frustum, with a smaller radial dimension near the negative pressure device 5 and a larger radial dimension near the suction cup 1, thus naturally forming a concave arc on the outer surface that is easy to grip.

[0050] When the negative pressure device 5 is in operation, the operator can naturally fit the thumb and index finger to the concave part of the outer wall of the guide ring 7. The inclined support surface provided by the conical frustum structure matches the human hand anatomy, stabilizes the direction of the applied gripping force, effectively increases the comfort and friction of the grip, and thus reliably fixes the guide ring 7, preventing it from unnecessary radial rotation with the negative pressure device 5, and ensuring that the clamping arm 8 only performs axial translation.

[0051] Preferably, the outer wall of the guide ring 7 is provided with anti-slip patterns 16. The anti-slip patterns 16 significantly increase the friction coefficient of the outer wall of the guide ring 7, providing the operator with a stable gripping point and preventing slipping during operation.

[0052] On the outer wall surface of the guide ring 7, regular or irregular protrusions or recessed patterns are provided, which form an anti-slip structure and increase the roughness of the surface.

[0053] When the operator pinches the guide ring 7 with their fingers to constrain its rotation, the anti-slip patterns 16 generate greater static friction with the skin of the fingers. This increased friction effectively resists the circumferential force on the guide ring 7 due to sliding friction between the communication pipe 3 or the movement transmission of the clamping arm 8, ensuring that the operator can stabilize the guide ring 7 with a smaller gripping force and prevent it from rotating or displacing accidentally during critical operation stages, thus ensuring the reliability of the entire clamping linkage process.

[0054] Preferably, the suction head 2 is made of medical-grade silicone, and the outer side of the suction head 2 is covered with a protective cover 17. This structure ensures effective sealing and provides soft contact and peripheral protection for the baby's head, minimizing the risk of potential mechanical damage to the baby's head during the suction process.

[0055] The main body of the suction head 2 is made of soft, biocompatible medical-grade silicone, and the inner side forms a flexible suction surface for adhering to the baby's head; on the outer side of the silicone suction head 2, a relatively more robust protective cover 17 is entirely covered, forming a double-layer composite structure.

[0056] In use, the inner medical-grade silicone suction surface can closely and softly adhere to the irregular contours of the baby's head, forming a reliable airtight seal to establish negative pressure; the outer protective cover 17 acts as a support framework, restraining excessive deformation of the silicone material and evenly distributing the suction stress, and also serving as a barrier and buffer when the suction head 2 comes into contact with the external environment or equipment, preventing direct hard contact with the baby's head.

[0057] Preferably, the clamping end 9 of the clamping arm 8 is covered with a flexible buffer layer 18. The flexible buffer layer 18 provides a direct soft contact interface between the clamping end 9 of the clamping arm 8 and the baby's head, effectively dispersing and buffering the clamping pressure, preventing excessive local pressure.

[0058] At the clamping end 9 of the clamping arm 8, the clamping surface is covered with a layer of flexible buffer material, which is closely combined with the underlying rigid clamping end 9 structure to form a rigid-flexible composite clamping contact surface.

[0059] When the clamping arm 8 is retracted to clamp the baby's head, the flexible buffer layer 18 first comes into contact with the skin of the head and deforms elastically. This deformation process increases the effective contact area, converting the concentrated force from the rigid clamping end 9 into a more widely distributed and uniform contact pressure, thereby significantly reducing the local mechanical stimulation to the baby's head, while ensuring the stability of the clamping and improving the safety of the operation.

[0060] In summary, the device is based on the integrated design of the suction cup 1, the communication pipe 3 and the negative pressure device 5. The suction head 2 and the baby's head form a suction cavity 4, and the negative pressure device 5 is used to increase the volume along the communication pipe 3 away from the suction cup 1 to form a stable negative pressure to achieve reliable suction. At the same time, based on the mechanical linkage of the guide ring 7 and the clamping arm 8, when the negative pressure device 5 moves the clamping arm 8 in its direction, the guide part on the clamping arm 8 is guided by the contour of the fixed guide ring 7, forcing the clamping arm 8 to swing and the clamping end 9 to retract inward, achieving clamping of the head. Further, through the threaded drive structure between the negative pressure device 5 and the communication pipe 3, and the sliding key 12 and the ring-shaped track 14 cooperation structure between the clamping arm 8 and the negative pressure device 5, the clamping arm 8 is only axially translated under the constraint of the guide ring 7 without rotating with the negative pressure device 5, ensuring the synchronous execution of suction and clamping actions during traction.

[0061] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0062] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0063] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An obstetric fetal head suction-assisted delivery device, characterized by, The application relates to a baby head suction device, which comprises the following parts: a suction disc (1) provided with a suction head (2) and a communication pipe (3), the suction head (2) and the baby head jointly form a suction cavity (4), and the communication pipe (3) is communicated with the suction cavity (4); a negative pressure device (5) provided with a negative pressure cavity (6) in the inside, the negative pressure cavity (6) is communicated with the suction cavity (4) through the communication pipe (3), and the negative pressure device (5) is axially away from the suction disc (1) to form a negative pressure in the suction cavity (4) to suck the baby head; a guide ring (7) which is slidably sleeved on the outside of the communication pipe (3); at least two oppositely arranged clamping arms (8), one end of each clamping arm (8) is connected with the negative pressure device (5) and can move along with the negative pressure device (5), one end of the clamping arm (8) away from the negative pressure device (5) forms a clamping end (9) for clamping the baby head, and the middle part of the clamping arm (8) is provided with a guide part, when the negative pressure device (5) drives the clamping arm (8) to move in the direction close to the negative pressure device (5), the clamping end (9) of each clamping arm (8) swings along with the guide part under the guidance of the guide ring (7) to clamp the baby head.

2. An obstetric fetal head suction-assisted delivery device according to claim 1, wherein, The negative pressure device (5) is provided with a first screw structure (10), the communication pipe (3) is provided with a second screw structure (11) matched with the first screw structure (10), so that the negative pressure device (5) can be axially moved along the communication pipe (3) through rotation.

3. An obstetric fetal head suction-assisted delivery device as claimed in claim 2 wherein, A dynamic sealing structure is arranged between the first screw structure (10) and the second screw structure (11) to keep the space air tightness of the communication between the negative pressure cavity (6) and the suction cavity (4).

4. An obstetric fetal head suction-assisted delivery device as claimed in claim 2 wherein, The end of the clamping arm (8) close to the negative pressure device (5) is provided with a sliding key (12), the negative pressure device (5) is provided with a rotating track ring (13) provided with an annular track (14), the sliding key (12) is slidably matched in the annular track (14), the middle part of the negative pressure device (5) is provided with a guide part, when the negative pressure device (5) drives the rotating track ring (13) to rotate, the guide ring (7) restricts the clamping arm (8), so that the clamping arm (8) cannot rotate along with the negative pressure device (5), thereby the sliding key (12) only relatively slides in the axial direction of the communication pipe (3) in the annular track (14).

5. The obstetric fetal head suction-assisted delivery device according to claim 2, wherein, The two clamping arms (8) are provided with a connecting piece (15) connected with each other.

6. An obstetric fetal head suction-assisted delivery device as claimed in claim 2 wherein, The guide ring (7) is made of flexible medical silica gel.

7. An obstetric fetal head suction-assisted delivery device as claimed in claim 2 wherein, The guide ring (7) is in the shape of a truncated conical platform, the radial dimension of the end of the guide ring (7) close to the negative pressure device (5) is smaller than that of the end close to the suction disc (1).

8. An obstetric fetal head suction-assisted delivery device as claimed in claim 2 wherein, The outer side wall of the guide ring (7) is provided with an anti-skid pattern (16).

9. The obstetric fetal head suction-assisted delivery device according to claim 1, wherein, The adsorption head (2) is made of medical silica gel material, the adsorption head (2) is used for adhering to the outside of the adsorption surface of the baby's head, and the outside of the adsorption head (2) is covered with a protective cover (17).

10. The obstetric fetal head suction-assisted delivery device according to claim 1, wherein, The clamping end (9) of the front end of the clamping arm (8) is covered with a flexible buffer layer (18).

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