A gynecological vacuum extraction device for assisted delivery

Abstract

This invention discloses a fetal head extraction device for obstetrics and gynecology, comprising a suction cup, a negative pressure device, a guide ring, and at least two clamping arms. The suction cup has an suction head and a connecting tube, with the suction head and the infant's head forming a suction cavity. The negative pressure device has a negative pressure cavity and is connected to the suction cavity through the connecting tube. When the negative pressure device moves away from the suction cup along the axial direction of the connecting tube, the suction cavity forms a negative pressure to attract the head. The guide ring is slidably sleeved on the outside of the connecting tube. One end of each clamping arm is connected to the negative pressure device, and the other end forms a clamping end. When the negative pressure device moves the clamping arm toward it, the guide portion of the clamping arm is guided by the guide ring and swings, causing the clamping end to retract and clamp the head. The purpose of this invention is to solve the problem that the traction action and the clamping action cannot be completed by the same mechanical structure in a coordinated manner.

Description

Technical Field

[0001] This invention relates to the field of fetal head extraction devices, and more particularly to a fetal head extraction device for obstetrics and gynecology. Background Technology

[0002] Vacuum extraction is a crucial technique for managing dystocia, and existing devices primarily rely on negative pressure suction cups to pull the fetal head. However, in practice, suction alone carries the risk of slippage during traction, especially when sustained or increased traction is required. While some improvements attempt to add independently operable clamping components to aid in fixation, "adsorption" and "clamping" are two separate operational steps, failing to achieve integrated coordination. This operational disconnect prevents midwives from automatically and immediately obtaining additional mechanical clamping force to enhance fixation and prevent slippage while applying traction, impacting the efficiency and safety of the procedure. Summary of the Invention

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

[0004] The objective of this invention is achieved through the following technical solution:

[0005] An obstetric vacuum extraction device includes a suction cup, a negative pressure device, a guide ring, and at least two opposing clamping arms. The suction cup has an suction head and a connecting tube, the suction head and the baby's head together forming a suction cavity, and the connecting tube connects to the suction cavity. The negative pressure device has a negative pressure cavity inside, which is connected to the suction cavity through the connecting tube. When the negative pressure device moves away from the suction cup along the axial direction of the connecting tube, it creates a negative pressure in the suction cavity to suction the baby's head. The guide ring is slidably sleeved on the outside of the connecting tube. The end of each clamping arm near the negative pressure device is connected to the negative pressure device and can move with the negative pressure device. The end of the clamping arm away from the negative pressure device forms a clamping end for clamping the baby's head. The middle of the clamping arm has a guide portion. When the negative pressure device moves the clamping arm in the direction close to the negative pressure device, the clamping end of each clamping arm swings with the guide portion under the guidance of the guide ring to clamp the baby's head.

[0006] Furthermore, the negative pressure device is provided with a first threaded structure, and the connecting pipe is provided with a second threaded structure that cooperates with the first threaded structure, so that the negative pressure device can move along the axial direction of the connecting pipe by rotation.

[0007] Furthermore, a dynamic sealing structure is provided between the first threaded structure and the second threaded structure to maintain the airtightness of the communication space between the negative pressure chamber and the adsorption chamber.

[0008] Furthermore, the clamping arm is provided with a sliding key at one end near the negative pressure device, the negative pressure device is provided with a rotating track ring, and the rotating track ring is provided with an annular track. The sliding key can be slidably engaged in the annular track. When the negative pressure device drives the rotating track ring to rotate, the guide ring constrains the clamping arm so that the clamping arm cannot rotate with the negative pressure device, thereby causing the sliding key to only slide relative to the connecting pipe along the axial direction within the annular track.

[0009] Furthermore, the two clamping arms are provided with interconnecting connectors.

[0010] Furthermore, the guide ring is made of flexible medical-grade silicone.

[0011] Furthermore, the guide ring is truncated conical in shape, and the radial dimension of the guide ring near the negative pressure device is smaller than the radial dimension near the suction cup.

[0012] Furthermore, the outer wall of the guide ring is provided with anti-slip texture.

[0013] Furthermore, the suction head is made of medical-grade silicone material, and the suction head is used to fit the outer side of the suction surface of the baby's head. The outer side of the suction head is covered with a protective cover.

[0014] Furthermore, the clamping end at 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 invention are as follows:

[0016] 1. Based on the integrated structure of suction cup, connecting tube and negative pressure device, the suction head and the baby's head form a suction cavity. The negative pressure cavity of the negative pressure device is connected to the suction cavity through the connecting tube. When the negative pressure device moves away from the suction cup along the axis of the connecting tube, the volume of the connecting space is increased in conjunction, thereby forming a stable negative pressure in the suction cavity to achieve reliable suction of the baby's head, providing a stable initial traction force basis for assisted delivery.

[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 to the negative pressure device to move synchronously with it. The distal ends of the clamping arms form the clamping ends, and a guide part is provided on the clamping arms to cooperate with the guide ring sleeved on the outside of the connecting tube. When the negative pressure device is activated and drives the clamping arms to move in its direction, the guide parts of each clamping arm are guided by the contour of the fixed guide ring, which forces the clamping arms to swing, thereby causing the clamping ends to retract inward to clamp the baby's head.

[0018] 3. Based on the threaded drive structure between the negative pressure device and the connecting pipe, and the sliding key and annular track matching structure between the clamping arm and the negative pressure device, the axial movement of the negative pressure device is achieved by the rotation of the thread to generate adsorption and traction actions. At the same time, through the radial sliding fit of the sliding key in the annular track of the rotating track ring, the clamping arm only moves axially under the constraint of the guide ring and does not rotate with the negative pressure device, ensuring that the clamping arm can perform clamping actions synchronously during the traction process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a fetal head extraction and delivery aid device for obstetrics and gynecology according to the present invention;

[0020] Figure 2 for Figure 1 A cross-sectional view of the structural schematic diagram from another perspective;

[0021] Figure 3 for Figure 2 A magnified view of a portion at point A shown.

[0022] In the diagram: 1. Suction cup; 2. Adsorption head; 3. Connecting tube; 4. Adsorption chamber; 5. Negative pressure device; 6. Negative pressure chamber; 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. Circular track; 15. Connector; 16. Anti-slip texture; 17. Protective cover; 18. Flexible buffer layer. Detailed Implementation

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] See Figures 1-3 A preferred embodiment of the present invention is described below:

[0027] An obstetric vacuum extraction device includes a suction cup 1, a negative pressure device 5, a guide ring 7, and at least two opposing clamping arms 8. The suction cup 1 has an suction head 2 and a connecting tube 3. The suction head 2 and the baby's head together form a suction cavity 4, and the connecting tube 3 connects to the suction cavity 4. The negative pressure device 5 has a negative pressure cavity 6 inside, which is connected to the suction cavity 4 through the connecting tube 3. When the negative pressure device 5 moves away from the suction cup 1 along the axial direction of the connecting tube 3, it creates a negative pressure in the suction cavity 4 to suction the baby's head. The guide ring 7 is slidably sleeved on the outside of the connecting tube 3. The end of each clamping arm 8 near the negative pressure device 5 is connected to the negative pressure device 5 and can move with the negative pressure device 5. The 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 has 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 with the guide part under the guidance of the guide ring 7 to clamp the baby's head. This device provides a stable and controllable initial traction force for assisted delivery of the fetal head by establishing a reliable negative pressure adsorption and synchronous mechanical clamping fixation at the baby's head.

[0028] The device mainly consists of a suction cup 1, a negative pressure device 5, a guide ring 7, and at least two opposing clamping arms 8. The suction head 2 at the front end of the suction cup 1 is used to form a suction cavity 4 with the baby's head, and is connected to the negative pressure cavity 6 inside the negative pressure device 5 through a connecting tube 3; the guide ring 7 is slidably sleeved on the outside of the connecting tube 3; the proximal end of each clamping arm 8 is connected to 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 that matches the contour of the guide ring 7.

[0029] When the negative pressure device 5 moves away from the suction cup 1 along the axial direction of the connecting pipe 3, the volume of the connecting space between the negative pressure chamber 6 and the suction chamber 4 increases, forming a stable negative pressure in the suction chamber 4, thereby adsorbing 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 synchronously in its direction. At this time, the fixed guide ring 7 interacts with the guide part on the clamping arm 8 through its contour, forcing each clamping arm 8 to swing inward, and finally causing all clamping ends 9 to retract inward, realizing the coordinated clamping of the baby's head.

[0030] In specific operation, firstly, the suction head 2 is aligned and attached to the baby's head. Then, the negative pressure device 5 is activated to move it away from the suction cup 1 along the connecting tube 3. At this time, the suction chamber 4 achieves suction fixation of the head under the action of negative pressure. As the negative pressure device 5 continues to move, the clamping arm 8 connected to it gradually swings inward under the contour guidance of the guide ring 7, so that the clamping end 9 is smoothly closed and contacts the head.

[0031] It is understandable that, based on the integrated structure of suction cup 1, connecting tube 3, and negative pressure device 5, the suction head 2 and the baby's head enclose to form a suction cavity 4. The negative pressure cavity 6 of the negative pressure device 5 is connected to the suction cavity 4 through the connecting tube 3. When the negative pressure device 5 moves away from the suction cup 1 along the axial direction of the connecting tube 3, the volume of the connecting space is increased in a coordinated manner, 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 assisted delivery. Based on the mechanical linkage design of guide ring 7 and clamping arm 8, the proximal ends of at least two oppositely arranged clamping arms 8 are connected to the negative pressure device 5 to move synchronously with it. The distal ends of the clamping arms 8 form clamping ends 9, and guide parts are provided on the clamping arms 8 to cooperate with the guide ring 7 fixedly sleeved outside the connecting tube 3. When the negative pressure device 5 is activated and drives the clamping arms 8 to move in its direction, the guide parts of each clamping arm 8 are guided by the contour of the fixed guide ring 7, forcing the clamping arms 8 to swing, thereby causing the clamping ends 9 to retract inward to clamp the baby's head.

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

[0033] The negative pressure device 5 has a first threaded structure 10 inside, while the connecting pipe 3 has a corresponding second threaded structure 11 on its outer or inner wall, together forming a precision threaded pair. This threaded pair is the core drive and guide mechanism that enables the negative pressure device 5 to move axially along the connecting pipe 3.

[0034] During operation, by rotating the negative pressure device 5, its first threaded structure 10 screws into the second threaded structure 11 of the connecting pipe 3, thereby driving the entire negative pressure device 5 to move smoothly away from the suction cup 1 along the axial direction of the connecting pipe 3. This axial movement directly increases the volume of the communication space between the negative pressure chamber 6 and the suction chamber 4, thereby creating negative pressure in the suction chamber 4 to suction the baby's head, while providing a controllable axial force for subsequent traction.

[0035] Preferably, a dynamic sealing structure is provided between the first threaded structure 10 and the second threaded structure 11 to maintain the airtightness of the communication space between the negative pressure chamber 6 and the adsorption chamber 4. This structure ensures the axial movement function of the threaded drive of the negative pressure device 5 while simultaneously maintaining the dynamic airtightness of the communication space between the negative pressure chamber 6 and the adsorption chamber 4.

[0036] One or more dynamic sealing structures are provided between the first threaded structure 10 of the negative pressure device 5 and the second threaded structure 11 of the connecting pipe 3. The dynamic sealing structure remains in contact with the threaded pair as it moves, but does not restrict relative rotation itself. Its core function is to fill the gap between the threads and keep them effectively sealed, thereby isolating the airflow channel formed by the threaded connection from the external atmosphere.

[0037] When the negative pressure device 5 moves axially along the connecting pipe 3 via the rotation of the thread, the dynamic sealing structure undergoes dynamic deformation or sliding friction as the relative position between the negative pressure device 5 and the connecting pipe 3 changes. Regardless of the axial position of the negative pressure device 5, this sealing structure can continuously seal the physical gap between the threaded pairs, ensuring that the entire sealed space composed of the negative pressure chamber 6, the connecting pipe 3, and the adsorption chamber 4 does not leak air, thereby generating and maintaining the required negative pressure as the volume of the connected space increases.

[0038] Preferably, the clamping arm 8 has a sliding key 12 at one end near the negative pressure device 5. The negative pressure device 5 has a rotating track ring 13, and the rotating track ring 13 has an annular track 14. The sliding key 12 can be slidably engaged within the annular track 14. When the negative pressure device 5 drives the rotating track ring 13 to rotate, the guide ring 7 constrains the clamping arm 8 so that the clamping arm 8 cannot rotate with the negative pressure device 5, thereby causing the sliding key 12 to slide relative to the connecting pipe 3 axially within the annular track 14. This structure achieves pure axial translation of the clamping arm 8 during the rotational traction of the negative pressure device 5, decoupling the rotational motion from the clamping function, and ensuring the stability and controllability of the clamping action.

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

[0040] When the negative pressure device 5 drives the rotating track ring 13 to rotate synchronously, the clamping arm 8, constrained by the contour of the guide ring 7, cannot rotate accordingly. In this state, the rotational motion of the rotating track ring 13 forces the sliding key 12 to slide within its annular track 14. Since the clamping arm 8 is restricted from rotation, this sliding is converted into a relative displacement between the sliding key 12 and the annular track 14 along the axial direction of the connecting pipe 3, thereby driving the entire clamping arm 8 to move only along the axial direction, providing axial input for subsequent clamping and swinging under the action of the guide ring 7.

[0041] It is understandable that, based on the threaded drive structure between the negative pressure device 5 and the connecting pipe 3, and the sliding key 12 and the annular track 14 cooperation structure between the clamping arm 8 and the negative pressure device 5, the axial movement of the negative pressure device 5 is achieved by the threaded rotation to generate adsorption and traction action. At the same time, through the radial sliding cooperation of the sliding key 12 in the annular track 14 of the rotating track ring 13, the clamping arm 8 only undergoes axial translation under the constraint of the guide ring 7 and does not rotate with the negative pressure device 5, ensuring that the clamping arm 8 can synchronously perform clamping action during the traction process.

[0042] Preferably, the two clamping arms 8 are provided with interconnecting connectors 15. The connectors 15 enable rigid linkage between the two clamping arms 8, ensuring a high degree of synchronization and stability of their movements.

[0043] Two opposing clamping arms 8 are connected to each other at a specific position by a connector 15, which combines the two originally independent clamping arms 8 into an integral frame structure.

[0044] When either clamping arm 8 tends 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 connector 15, forcing the two clamping arms 8 to move synchronously, thereby ensuring that the two clamping ends 9 can close or open simultaneously and symmetrically, so as to achieve uniform and balanced clamping of the baby's head.

[0045] Preferably, the guide ring 7 is made of flexible medical-grade silicone. This flexible material allows the operator to manually hold and secure the guide ring 7, preventing it from undergoing unintended radial following rotation when the negative pressure device 5 rotates.

[0046] The guide ring 7 is made of flexible medical-grade silicone. Its inner ring contour maintains the structure required for the guiding function, while the outer surface provides friction for easy manual gripping and the flexibility to be pinched.

[0047] When the operator rotates the negative pressure device 5 to generate negative pressure, they can pinch the outer surface of the flexible silicone guide ring 7 with their fingers, using the friction and deformation of the silicone to provide a stable manual gripping force. This gripping force effectively constrains the guide ring 7, preventing it from sliding against the connecting tube 3 and keeping it stationary, thus preventing it from rotating with the negative pressure device 5. This provides the 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 cone, and the radial dimension of the end of the guide ring 7 near the negative pressure device 5 is smaller than the radial dimension of the end near the suction cup 1. The shape of this truncated cone structure conforms to the natural curvature of the human hand's thumb and forefinger, allowing the operator to hold the guide ring 7 comfortably and firmly, thus preventing it from rotating during operation.

[0049] The guide ring 7 is truncated cone-shaped, with a smaller radial dimension at the end near the negative pressure device 5 and a larger radial dimension at the end near the suction cup 1, thus naturally forming a concave arc on the outer surface that is conducive to gripping.

[0050] When the negative pressure device 5 is rotated, the operator can naturally place their thumb and forefinger against the concave surface of the outer wall of the guide ring 7. The truncated cone structure provides an inclined support surface that matches the anatomy of the human hand, stabilizing the direction of the applied gripping force and effectively increasing grip comfort and friction. This reliably fixes the guide ring 7, preventing it from undergoing 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 texture 16. The anti-slip texture 16 significantly increases the coefficient of friction of the outer wall of the guide ring 7, providing the operator with a stable grip point and preventing slippage during operation.

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

[0053] When the operator pinches the guide ring 7 with their fingers to restrain its rotation, the anti-slip texture 16 generates greater static friction with the skin of the fingers. This increased friction effectively resists the circumferential force transmitted from the sliding friction between the guide ring 7 and the connecting tube 3 or the movement of the clamping arm 8, ensuring that the operator can stably fix the guide ring 7 with less gripping force, preventing it from rotating or displacing unexpectedly during critical operation stages, thereby ensuring the reliability of the entire clamping linkage process.

[0054] Preferably, the adsorption head 2 is made of medical-grade silicone. The adsorption head 2 is used to conform to the outer side of the adsorption surface of the infant's head, and the outer side of the adsorption head 2 is covered with a protective cover 17. This structure ensures effective sealing and adsorption while providing soft contact and external protection for the infant's head, minimizing the risk of potential mechanical damage to the infant's head during the adsorption process.

[0055] The main body of the adsorption head 2 is made of soft, biocompatible medical silicone, with a flexible adsorption surface formed on its inner side for fitting the baby's head; on the outer side of the silicone adsorption head 2, a relatively tougher protective cover 17 is wrapped around it, together forming a double-layer composite structure.

[0056] When in use, the inner medical silicone adsorption surface can closely and gently conform to the irregular contour of the baby's head, forming a reliable airtight seal to establish negative pressure; the outer protective cover 17 serves as a support frame, on the one hand restraining excessive deformation of the silicone material and evenly distributing adsorption stress, and on the other hand, acting as an isolation and buffer when the adsorption head 2 comes into contact with the external environment or instruments, preventing the baby's head from being subjected to direct hard contact.

[0057] Preferably, the clamping end 9 at the front end of the clamping arm 8 is covered with a flexible buffer layer 18. This 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 and preventing excessive local pressure.

[0058] At the clamping end 9 at the front end of the clamping arm 8, the clamping surface is covered with a layer of flexible buffer material. This layer is tightly integrated with the rigid clamping end 9 structure below to form a rigid-flexible composite clamping contact surface.

[0059] When the clamping arm 8 retracts to clamp the baby's head, the flexible buffer layer 18 first contacts the scalp and undergoes elastic deformation. This deformation process increases the effective contact area, transforming the concentrated force from the rigid clamping end 9 into a wider and more uniform contact pressure, thereby significantly reducing local mechanical stimulation to the baby's head and improving operational safety while ensuring clamping stability.

[0060] In summary, this device is based on the integrated design of suction cup 1, connecting tube 3, and negative pressure device 5. The suction head 2 surrounds the infant's head to form a suction cavity 4. The negative pressure device 5 moves axially away from the suction cup 1 along the connecting tube 3 to increase the volume, creating a stable negative pressure for reliable suction. Simultaneously, based on the mechanical linkage between 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 portion 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, thus clamping the head. Furthermore, through the threaded drive structure between the negative pressure device 5 and the connecting tube 3, and the sliding key 12 and annular track 14 cooperation structure between the clamping arm 8 and the negative pressure device 5, the clamping arm 8, under the constraint of the guide ring 7, only undergoes axial translation and does not rotate with the negative pressure device 5, ensuring the synchronous execution of suction and clamping actions during traction.

[0061] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fetal head vacuum extraction device for obstetrics and gynecology, characterized in that, include: The suction cup (1) is provided with an adsorption head (2) and a connecting tube (3). The adsorption head (2) and the baby's head together form an adsorption cavity (4). The connecting tube (3) connects to the adsorption cavity (4). The negative pressure device (5) has a negative pressure chamber (6) inside, and the negative pressure chamber (6) is connected to the adsorption chamber (4) through the connecting pipe (3); when the negative pressure device (5) moves away from the suction cup (1) along the axial direction of the connecting pipe (3), the adsorption chamber (4) forms a negative pressure to adsorb the baby's head. A guide ring (7) is slidably sleeved on the outside of the connecting pipe (3); At least two opposing clamping arms (8); one end of each clamping arm (8) near the negative pressure device (5) is connected to the negative pressure device (5) and can move with the negative pressure device (5); the end of the clamping arm (8) away from the negative pressure device (5) forms a clamping end (9) for clamping the baby's head; a guide portion is provided in the middle of the clamping arm (8), and 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) with the guide portion to clamp the baby's head.

2. The obstetric and gynecological fetal head extraction device according to claim 1, characterized in that, The negative pressure device (5) is provided with a first threaded structure (10), and the connecting pipe (3) is provided with a second threaded structure (11) that cooperates with the first threaded structure (10), so that the negative pressure device (5) can move along the axial direction of the connecting pipe (3) by rotation.

3. The obstetric and gynecological fetal head extraction device according to claim 2, characterized in that, A dynamic sealing structure is provided between the first threaded structure (10) and the second threaded structure (11) to maintain the airtightness of the communication space between the negative pressure chamber (6) and the adsorption chamber (4).

4. The obstetric and gynecological fetal head extraction device according to claim 2, characterized in that, The clamping arm (8) is provided with a sliding key (12) at one end near the negative pressure device (5). The negative pressure device (5) is provided with a rotating track ring (13) and a ring track (14). The sliding key (12) can be slidably engaged in the ring track (14). The negative pressure device (5) is provided with a guide part in the middle. When the negative pressure device (5) drives the rotating track ring (13) to rotate, the guide ring (7) constrains 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 slides relative to the connecting pipe (3) in the ring track (14).

5. The obstetric and gynecological fetal head extraction device according to claim 2, characterized in that, The two clamping arms (8) are provided with interconnecting connectors (15).

6. The obstetric and gynecological fetal head extraction device according to claim 2, characterized in that, The guide ring (7) is made of flexible medical silicone.

7. The obstetric and gynecological fetal head extraction device according to claim 2, characterized in that, The guide ring (7) is truncated cone-shaped, and the radial dimension of the guide ring (7) near the negative pressure device (5) is smaller than the radial dimension near the suction cup (1).

8. The obstetric and gynecological fetal head extraction device according to claim 2, characterized in that, The outer wall of the guide ring (7) is provided with anti-slip texture (16).

9. The obstetric and gynecological fetal head extraction device according to claim 1, characterized in that, The suction head (2) is made of medical silicone material. The suction head (2) is used to fit the outer side of the suction surface of the baby's head. The outer side of the suction head (2) is covered with a protective cover (17).

10. The obstetric and gynecological fetal head extraction device according to claim 1, characterized in that, The clamping end (9) at the front end of the clamping arm (8) is covered with a flexible buffer layer (18).

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