Obstetrical midwifery device

Abstract

The invention belongs to the technical field of medical instruments, and particularly discloses an obstetrical midwifery device which comprises a fetal head suction cup and further comprises a traction tube arranged at the rear end of the fetal head suction cup, a force unloading buffering protection mechanism arranged at the rear end of the traction tube and a ventilation cylinder arranged behind the force unloading buffering protection mechanism. A first lifting pipe, a second lifting pipe, an air exhaust hose and a sliding pipe are communicated with the outer wall of the air exchange cylinder in a cross-shaped distribution manner, the end part of the first lifting pipe is communicated with a first negative pressure cylinder, the end part of the second lifting pipe is communicated with a second negative pressure cylinder, the end part of the air exhaust hose is communicated with a manual pump, and the sliding pipe is connected with a force unloading buffer protection mechanism. A double-negative-pressure-source alternate standby mechanism is adopted, once the suction cup falls off, a standby negative pressure source can be instantly switched, rapid re-adsorption is achieved, meanwhile, the device has a traction force feedback buffering function, when traction force exceeds a threshold value, transmission connection is automatically converted from rigidity to elastic buffering, effective force unloading is achieved, and the service life of the device is prolonged. And injury to fetuses and lying-in women caused by excessive traction is prevented.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical devices, and particularly relates to an obstetric delivery device. BACKGROUND

[0002] In obstetric clinical practice, when the puerperant appears uterine contraction weakness, prolonged labor or fetal intrauterine distress and other indications in the second stage of labor, the delivery of the fetus often needs to be assisted by delivery devices. Among them, the fetal head suction device has become one of the most widely used delivery tools in clinical application because it causes less damage to the birth canal than forceps and is relatively easy to operate. Its basic working principle is to use the principle of negative pressure adsorption to tightly adsorb the suction cup to the head of the fetus, and to apply a pulling force through the traction handle to cooperate with the uterine contraction of the puerperant to pull the fetus out of the birth canal.

[0003] In the existing negative pressure generation technology, some use mechanical and electrical vacuum pumps such as piston pumps and diaphragm pumps as continuous negative pressure sources. Due to the extremely small volume (micro-space) of the sealed cavity between the suction cup and the fetal head, the vacuum degree rises exponentially during pumping. Limited by mechanical inertia and sensor response lag, the system is difficult to achieve millisecond-level precision cutting after reaching the preset negative pressure value. This "overshoot" phenomenon is extremely easy to cause instantaneous excessive negative pressure, causing fetal scalp hematoma or even intracranial injury; another common way to generate negative pressure is to use a Venturi tube device designed based on the Bernoulli principle. Although this type of device is safer than mechanical and electrical pumps and is not easy to cause instantaneous high negative pressure injury, it is often difficult to establish and maintain sufficient suction force in a short time in actual clinical operation, resulting in frequent insufficient suction.

[0004] In view of the defects of the above two methods, the most effective and commonly used method in clinical practice is still a manual negative pressure pump. However, it has the following disadvantages in actual operation: during the delivery process, the suction cup is easily accidentally detached due to factors such as compression of the birth canal, change of the fetal head angle or deviation of the traction direction. Once detached, the existing manual device must be repeatedly pumped manually to reestablish the negative pressure. In the time-critical obstetric emergency, this tedious repeated operation process wastes rescue time and increases the risk to the puerperant and the fetus.

[0005] At the same time, the existing manual delivery device usually adopts rigid connection, that is, the operator directly applies force to the suction cup through the handle via the traction rod. This structure lacks a mechanical feedback loop or a passive safety release mechanism. The size of the traction force completely depends on the subjective feeling and experience judgment of the medical staff, and the operator is extremely easy to cause the traction force to exceed the bearing limit of the fetal cervical spine or the puerperant birth canal, thereby causing fetal nerve damage, fracture or severe soft birth canal laceration of the puerperant. SUMMARY

[0006] In view of the above, the present application provides a kind of obstetric midwifery device, using double negative pressure source alternate standby mechanism, while the first negative pressure source adsorption is carried out to the second negative pressure source pre-pumping standby, once suction cup falls off, can be switched to standby negative pressure source instantaneously, realize quick re-adsorption, greatly shorten first-aid time, while the device has traction force feedback buffer function, when traction force exceeds threshold value, transmission connection is automatically changed from rigidity to elastic buffer and realizes effective unloading, prevent excessive traction to fetus and puerpera cause mechanical damage.

[0007] The technical solutions adopted by the present application are as follows: The present application provides an obstetric midwifery device, which includes a fetal head suction cup, a traction pipe arranged at the rear end of the fetal head suction cup, a force unloading buffer protection mechanism arranged at the rear end of the traction pipe, and a gas exchange cylinder arranged behind the force unloading buffer protection mechanism.

[0008] Further, the outer wall of the gas exchange cylinder is in cross-shaped distribution and is connected with a first lifting pipe, a second lifting pipe, an air suction hose, and a sliding pipe. The end of the first lifting pipe is connected with a first negative pressure cylinder. The end of the second lifting pipe is connected with a second negative pressure cylinder. The end of the air suction hose is connected with a hand pump. The sliding pipe is connected with the force unloading buffer protection mechanism.

[0009] Further, the gas exchange cylinder is internally provided with a diversion valve. The diversion valve is used to switch the internal flow channel during rotation, so that when the sliding pipe is connected with one of the first negative pressure cylinder and the second negative pressure cylinder to provide negative pressure for the fetal head suction cup, the hand pump is operated to pre-pump the other one of the first negative pressure cylinder and the second negative pressure cylinder.

[0010] Further, the sliding pipe is oppositely arranged with the air suction hose. The second lifting pipe is oppositely arranged with the first lifting pipe. The diversion valve is arranged at the same height as the inner cavity of the gas exchange cylinder. The diversion valve is in a rectangular plate structure. The two end faces of the diversion valve are tightly attached to the inner wall of the gas exchange cylinder. The arc surface of the end of the diversion valve for blocking the flow channel is larger than the inner hole diameter of the connection between the first lifting pipe, the second lifting pipe, the air suction hose, and the sliding pipe and the gas exchange cylinder, to prevent flow from occurring when the flow channel is switched.

[0011] Further, a rotating shaft is arranged at the middle of the upper end of the diversion valve. The rotating shaft is coaxially rotated and penetrates the upper wall of the gas exchange cylinder. A handle is arranged on the rotating shaft. The handle is arranged in parallel with the diversion valve. Two positioning heads are symmetrically arranged on the surface of the gas exchange cylinder. The two positioning heads are respectively located at the two limit positions of the rotating stroke of the handle, to limit the diversion valve.

[0012] Further, when the handle is rotated to be limited by one of the positioning heads, the sliding pipe is only communicated with the first lifting pipe through the blocking of the diverter valve, and at the same time, the second lifting pipe is only communicated with the air suction hose; when the handle is reversely rotated to be limited by the other positioning head, the sliding pipe is only communicated with the second lifting pipe through the blocking of the diverter valve, and at the same time, the first lifting pipe is only communicated with the air suction hose, so that the switching of the flow channel is realized.

[0013] Further, the force unloading buffer protection mechanism comprises an expansion pipe coaxially communicated with the rear end of the traction pipe and an extension pipe coaxially communicated with the rear end of the expansion pipe, the front end of the sliding pipe is slidingly and sealingly arranged in the extension pipe, the inside of the expansion pipe is symmetrically fixed with electromagnets at the end close to the head sucker, and the outside of the expansion pipe is provided with a driving power source electrically connected with the electromagnets.

[0014] Further, the inside of the expansion pipe is symmetrically fixed with sliding shafts at the end away from the head sucker, sliding blocks are slidingly arranged on the sliding shafts, the sliding blocks are symmetrically fixed at the front end of the sliding pipe, the sliding shafts are sleeved with return springs, and the return springs are located at the side of the sliding blocks away from the electromagnets; in the initial state, the sliding blocks are fixed by the electromagnets.

[0015] Further, when the traction pipe is subjected to a pulling force exceeding the set adsorption threshold of the electromagnets, the sliding blocks are separated from the electromagnets and slide backward along the sliding shafts to compress the return springs; when the pulling force is removed, the sliding blocks are reset under the action of the return springs and are re-adsorbed by the electromagnets.

[0016] Further, the hand pump is provided with an air pressure gauge, and the first negative pressure cylinder and the second negative pressure cylinder are made of light materials.

[0017] The beneficial effects achieved by the above structure are as follows: (1) The present application designs a double negative pressure source alternate standby mechanism to solve the problem that the existing hand pump assisted delivery device needs to repeatedly reciprocate air suction after the sucker falls off, which wastes the first aid time, the flow channel switching is realized through the switching of the flow channel of the air exchange cylinder internal diverter valve, so that the device can use one negative pressure cylinder to provide negative pressure adsorption for the head sucker, and at the same time, the other idle negative pressure cylinder can be pre-suctioned by the hand pump for standby, in case of accidental falling off, without the need for complicated manual air suction operation, only the reverse rotation of the handle is needed to instantly connect the standby high vacuum negative pressure cylinder, which greatly shortens the treatment time.

[0018] (2) The present application realizes the buffer protection function of negative pressure establishment through the cooperation of the diverter valve and the flow channel port of the inner wall of the air exchange cylinder, when the negative pressure source is switched, the end arc surface of the diverter valve slowly moves away from the block, so that the communication area between the negative pressure cylinder and the sliding pipe gradually increases from small to large, this structure design makes the negative pressure not act on the fetal head in an instant, but produces a gradual adsorption process, which improves the safety of the operation.

[0019] (3) The present application solves the problem of lack of mechanical feedback of traditional obstetric device rigid connection, sets the unloading buffer protection mechanism based on the principle of electromagnetic adsorption, when the traction force exceeds the safety threshold set by the electromagnet, the slider will be instantaneously separated from the restraint of the electromagnet, so that the transmission connection is automatically changed from rigid to elastic buffer state, at this time the slider slides backward along the slide shaft and compresses the return spring, which prevents mechanical injury to the fetus and the birth canal of the puerpera caused by excessive force of the operator through the physical unloading of mechanical structure.

[0020] (4) The present application has the advantage of meeting the human body force mechanics, which can ensure that the operator does not distract in emergency, when the overload unloading occurs, the operator's hands will be instantaneously backward due to inertia, and the force will be unloaded instinctively, at this time, combined with the elastic force of the return spring, the slider will be automatically pushed back to the original position and re-adsorbed and locked by the electromagnet, the whole process does not need the medical staff to take their eyes off the operation area, and does not need to carry out complex mechanical reset operation, which ensures the continuity and concentration of the obstetric process. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a first three-dimensional structure schematic diagram of an obstetric device for obstetrics proposed by the present application.

[0022] Figure 2 It is a second three-dimensional structure schematic diagram of an obstetric device for obstetrics proposed by the present application.

[0023] Figure 3 It is a structure schematic diagram of the position relationship between the rotating handle and the positioning head of an obstetric device for obstetrics proposed by the present application.

[0024] Figure 4 It is a structure schematic diagram of the position relationship between the steering valve and the air cylinder of an obstetric device for obstetrics proposed by the present application.

[0025] Figure 5 It is Figure 2 It is an enlarged view of part A.

[0026] Figure 6 It is a structure schematic diagram of the electromagnet and the slider adsorption of an obstetric device for obstetrics proposed by the present application.

[0027] Figure 7 It is a structure schematic diagram of the electromagnet and the slider separation of an obstetric device for obstetrics proposed by the present application.

[0028] Wherein, 1, fetal head suction disc, 2, traction tube, 3, gas exchange cylinder, 31, first lifting tube, 32, second lifting tube, 33, air suction hose, 34, sliding tube, 4, unloading buffer protection mechanism, 41, expansion tube, 42, extension tube, 43, electromagnet, 44, driving power supply, 45, sliding block, 46, sliding shaft, 47, reset spring, 5, hand pump, 51, air pressure gauge, 6, first negative pressure cylinder, 7, second negative pressure cylinder, 8, steering valve, 81, rotating shaft, 82, handle, 83, positioning head.

[0029] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of this specification, illustrate embodiments of the present application, and are used to explain the present application, and do not constitute a limitation on the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments of the present application. 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.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element 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.

[0032] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 The present application proposes a midwifery device for obstetrics, and the specific structure includes a fetal head suction disc 1, a traction tube 2 arranged at the rear end of the fetal head suction disc 1, an unloading buffer protection mechanism 4 arranged at the rear end of the traction tube 2, and a gas exchange cylinder 3 arranged at the rear of the unloading buffer protection mechanism 4.

[0033] The air cylinder 3 is the core component of negative pressure distribution, and the outer wall of the cylinder is in a cross-shaped circumferential array distribution and is provided with four interface pipes, which are a first lifting pipe 31, a second lifting pipe 32, an air suction hose 33 and a sliding pipe 34. The sliding pipe 34 is arranged opposite to the air suction hose 33, and the second lifting pipe 32 is arranged opposite to the first lifting pipe 31. The end of the first lifting pipe 31 is communicated with a first negative pressure cylinder 6, and the end of the second lifting pipe 32 is communicated with a second negative pressure cylinder 7. In order to reduce the operation burden of medical staff, the first negative pressure cylinder 6 and the second negative pressure cylinder 7 are preferably made of high-strength lightweight materials (such as engineering plastics). The end of the air suction hose 33 is communicated with a hand pump 5, and a pressure gauge 51 is arranged on the hand pump 5 for real-time monitoring of the negative pressure value in the current circuit. The sliding pipe 34 is connected with the front force relief buffer protection mechanism 4.

[0034] A diversion valve 8 is arranged at the inner center position of the air cylinder 3. The diversion valve 8 is in a rectangular plate structure, and the height thereof is equal to the inner cavity of the air cylinder 3. The two end faces of the diversion valve 8 are designed as arc faces which are tightly fitted with the inner wall of the air cylinder 3, and the size of the arc faces is greater than the inner hole diameter of the communication part of the first lifting pipe 31, the second lifting pipe 32, the air suction hose 33 and the sliding pipe 34 with the air cylinder 3, so as to ensure that the diversion valve 8 can completely block the corresponding pipe opening during rotation, preventing air flow from flowing together. The upper middle part of the diversion valve 8 is fixedly connected with a rotating shaft 81 which penetrates the upper wall of the air cylinder 3 and extends to the outside, and a handle 82 is arranged at the end of the rotating shaft 81 for rotation by the operator. In order to accurately control the valve position, two positioning heads 83 are symmetrically arranged on the surface of the air cylinder 3. The two positioning heads 83 are respectively located at the two limit positions of the rotation stroke of the handle 82, and the rotation angle of the handle 82 can be limited to 90 degrees.

[0035] The force relief buffer protection mechanism 4 is used to provide overload protection. The mechanism includes an expansion pipe 41 coaxially arranged at the rear end of the traction pipe 2, and an extension pipe 42 coaxially arranged at the rear end of the expansion pipe 41. The front end of the sliding pipe 34 is slidingly sealed in the extension pipe 42 and can relatively displace in the axial direction. In the expansion pipe 41, electromagnets 43 are symmetrically fixed at the end close to the head suction disc 1. The expansion pipe 41 is provided with a driving power source 44 electrically connected with the electromagnets 43 (which can be an internal battery or an external power source). Symmetrically fixed at the end of the expansion pipe 41 away from the head suction disc 1 is a sliding shaft 46, on which a sliding block 45 is slidingly arranged. The sliding block 45 is symmetrically fixed at the front end of the sliding pipe 34. In addition, the sliding shaft 46 is also sleeved with a return spring 47, which is located on the side of the sliding block 45 away from the electromagnets 43.

[0036] In the initial state, the attraction threshold of the electromagnets 43 is set by adjusting the current of the driving power source 44. The sliding block 45 is firmly attracted and fixed by the electromagnets 43, and the device is in a rigid connection state at this time, which can effectively transmit the traction force.

[0037] The specific work process is as follows: Pre-evacuation stage: The operator holds the air exchange cylinder 3 with one hand in a "forked grip" manner, with fingers gripping the first lifting tube 31 and the second lifting tube 32 respectively. The slide tube 34 extends out from between the fingers. The drive power supply 44 is turned on, and the attraction threshold of the electromagnet 43 is adjusted so that the slider 45 is attracted and fixed by the electromagnet 43. Then the operator rotates the handle 82 until it is limited by one of the positioning heads 83. At this time, the diverting valve 8 divides two independent flow channels inside the air exchange cylinder 3: the slide tube 34 is only connected to the first lifting tube 31 (forming the first circuit), while the second lifting tube 32 is only connected to the suction hose 33 (forming the second circuit). Another operator operates the manual pump 5 and observes the pressure gauge 51. At this time, the manual pump 5 is actually evacuating the second negative pressure cylinder 7. When the preset negative pressure value is reached, the second negative pressure cylinder 7 is in a "standby" state, storing enough vacuum energy.

[0038] During the suction-assisted delivery stage: The fetal head suction cup 1 is accurately placed over the fetal head. At this time, the first negative pressure cylinder 6 is connected to the fetal head suction cup 1 through the first lifting tube 31, the sliding tube 34, the force relief buffer protection mechanism 4, and the traction tube 2. The operator slowly rotates the handle 82 in the opposite direction. In the initial stage of rotation, the end of the steering valve 8 gradually blocks the ports of the second lifting tube 32 and the first lifting tube 31. As the rotation continues, the steering valve 8 gradually opens the passage between the first negative pressure cylinder 6 and the manual pump 5, and at the same time gradually opens the passage between the second negative pressure cylinder 7 (which has been pre-emptively depressurized) and the sliding tube 34. This process utilizes the change in the port connection area when the steering valve 8 is rotated. The process achieves a "gradual" adsorption effect. The high negative pressure in the second negative pressure cylinder 7 is not applied to the fetal head instantly, but rather a small air pressure is generated through tiny gaps for adsorption. As the handle 82 continues to rotate until it is limited by another positioning head 83, the flow channel is completely switched, and the second negative pressure cylinder 7 is fully connected to the slide tube 34, achieving stable adsorption of the fetal head. During the process of pulling the fetus outward, another medical staff member (or assistant) can operate the manual pump 5. At this time, the manual pump 5 is connected to the first lifting tube 31 and begins to pump air from the first negative pressure cylinder 6 to reach the preset negative pressure value, thereby completing the alternation of the dual negative pressure sources.

[0039] Rapid re-adsorption after accidental detachment: If the tire head suction cup 1 accidentally detaches during traction, the operator does not need to perform tedious repeated air extraction operations. Simply cover the tire head with the tire head suction cup 1 again, and then rotate the handle 82 in the opposite direction to another extreme position. At this time, the flow channel is switched again, and the first negative pressure cylinder 6, which has just been pre-evacuated, is connected to the slide tube 34 to achieve rapid re-adsorption, which greatly shortens the emergency rescue time.

[0040] Overload relief protection mechanism: During assisted delivery traction, if the operator exerts too much force, causing the tension on the traction tube 2 to exceed the attraction force threshold set by the electromagnet 43, the slider 45 will instantly break free from the electromagnet 43. According to the principle of human force exertion, when the rigid connection is suddenly broken, the operator's hand will move backward due to inertia and relieve force at this moment (i.e., involuntarily reduce the force exertion). At this time, the slider 45 slides backward along the sliding shaft 46 and compresses the return spring 47. The compression of the return spring 47 further buffers the excess kinetic energy, avoiding mechanical strain on the fetus or birth canal. When the operator senses the force relief feedback, they will instinctively stop exerting force. At this time, under the elastic force of the return spring 47, the slider 45 is pushed back to its original position and is attracted by the electromagnet 43 again. The device automatically returns to the working state for the next traction operation.

[0041] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. An obstetric delivery device, comprising a fetal head suction cup (1), characterized in that: It also includes a traction tube (2) located at the rear end of the tire head suction cup (1), a force relief buffer protection mechanism (4) located at the rear end of the traction tube (2), and an air exchange cylinder (3) located behind the force relief buffer protection mechanism (4). The outer wall of the air exchange cylinder (3) is provided with a first lifting pipe (31), a second lifting pipe (32), an air extraction hose (33), and a sliding pipe (34) in a cross shape. The end of the first lifting pipe (31) is connected to a first negative pressure cylinder (6), the end of the second lifting pipe (32) is connected to a second negative pressure cylinder (7), the end of the air extraction hose (33) is connected to a manual pump (5), and the sliding pipe (34) is connected to a force relief buffer protection mechanism (4). The air exchange cylinder (3) is equipped with a directional valve (8); the directional valve (8) is used to switch the internal flow channel during rotation, so that when the slide tube (34) is connected to one of the first negative pressure cylinder (6) and the second negative pressure cylinder (7) to provide negative pressure to the tire head suction cup (1), the manual pump (5) is operated to pre-evacuate the other connection of the first negative pressure cylinder (6) and the second negative pressure cylinder (7).

2. The obstetric delivery device according to claim 1, characterized in that: The slide tube (34) is arranged opposite to the suction hose (33), the second lifting tube (32) is arranged opposite to the first lifting tube (31), the directional valve (8) is arranged at the same height as the inner cavity of the air exchange cylinder (3), the directional valve (8) has a rectangular plate structure, the two ends of the directional valve (8) are tightly fitted with the inner wall of the air exchange cylinder (3), and the arc surface size of the end of the directional valve (8) used to block the flow channel is larger than the inner diameter of the first lifting tube (31), the second lifting tube (32), the suction hose (33) and the slide tube (34) at the connection with the air exchange cylinder (3).

3. The obstetric delivery device according to claim 2, characterized in that: The upper middle part of the steering valve (8) is provided with a rotating shaft (81). The rotating shaft (81) rotates coaxially through the upper wall of the air exchange cylinder (3). The rotating shaft (81) is provided with a handle (82). The handle (82) is arranged parallel to the steering valve (8). The surface of the air exchange cylinder (3) is symmetrically provided with two positioning heads (83). The two positioning heads (83) are located at the two extreme positions of the rotation stroke of the handle (82).

4. The obstetric delivery device according to claim 3, characterized in that: When the handle (82) is rotated to the point where it is limited by one of the positioning heads (83), the slide tube (34) is connected to the first lifting tube (31) only through the obstruction of the directional valve (8), and at the same time the second lifting tube (32) is connected to the suction hose (33) only. When the handle (82) is rotated in the opposite direction to the point where it is limited by the other positioning head (83), the slide tube (34) is connected to the second lifting tube (32) only through the obstruction of the directional valve (8), and at the same time the first lifting tube (31) is connected to the suction hose (33) only.

5. The obstetric delivery device according to claim 4, characterized in that: The unloading buffer protection mechanism (4) includes an expansion tube (41) coaxially connected to the rear end of the traction tube (2) and an extension tube (42) coaxially connected to the rear end of the expansion tube (41). The front end of the slide tube (34) is slidably sealed inside the extension tube (42). An electromagnet (43) is symmetrically fixed inside the expansion tube (41) near the end of the tire head suction cup (1). A drive power supply (44) electrically connected to the electromagnet (43) is provided outside the expansion tube (41).

6. The obstetric delivery device according to claim 5, characterized in that: The expansion tube (41) has a sliding shaft (46) symmetrically fixed at one end away from the tire head suction cup (1). A slider (45) is slidably sleeved on the sliding shaft (46). The slider (45) is symmetrically fixed at the front end of the slide tube (34). A return spring (47) is sleeved on the sliding shaft (46). The return spring (47) is located on the side of the slider (45) away from the electromagnet (43). In the initial state, the slider (45) is attracted and fixed by the electromagnet (43).

7. The obstetric delivery device according to claim 6, characterized in that: When the pulling force on the traction tube (2) exceeds the adsorption force threshold set by the electromagnet (43), the slider (45) disengages from the electromagnet (43) and slides backward along the sliding shaft (46) to compress the reset spring (47); when the pulling force is released, the slider (45) resets under the action of the reset spring (47) and is re-adsorbed by the electromagnet (43).

8. The obstetric delivery device according to claim 7, characterized in that: The manual pump (5) is equipped with a pressure gauge (51), and the first negative pressure cylinder (6) and the second negative pressure cylinder (7) are both made of lightweight materials.

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