Teaching mold for vaginal examination of pregnant women and its use method

Abstract

The invention discloses a teaching mold for vaginal examination of pregnant women, which belongs to the technical field of obstetric teaching aids. The support body simulates the pelvis of pregnant women, the transparent elastic bag body simulates the uterus of pregnant women, and the mold body simulates the fetus to be delivered. During clinical teaching, students can intuitively experience the measurement in the pelvis on the teaching aid. Under the operation of the teaching teacher, the three stages of maternal delivery are simulated, so that students can better and quickly achieve the purpose of expected clinical practice and clinical experience accumulation through theoretical combination of clinical teaching. The elastic bag body is provided with an opening for the teaching teacher to reach in and push the mold body, and an outlet is provided to simulate the uterine cervix, so that students can use their hands to feel the process of the cervix expanding to full opening during the progress of the simulated labor process; the support body is divided into a left support and a right support, and the front end is hinged, and the rear end is connected by an elastic strip A. In the process of pushing the mold body down, the expansion of the cervix can be well simulated, which fits the whole process of maternal delivery, and the students are impressed and can better master the teaching content. The teaching aid can not only avoid reducing the number of vaginal examinations on patients due to clinical teaching, and reduce the risk of upward infection of patients, but also reduce the discomfort caused by teaching during the delivery of patients and the occurrence of medical disputes.

Description

Technical Field

[0001] The invention belongs to the technical field of obstetric teaching aids, and in particular relates to a teaching mold for vaginal examination of pregnant women and a use method thereof. Background Art

[0002] There are three stages of labor in a normal vaginal delivery. The first stage is also called the cervical dilation stage, which refers to the beginning of labor until the cervix is ​​fully dilated (10 cm). The important sign of labor is the presence and gradual strengthening of uterine contractions, which last for 30 seconds or more, with an interval of 5-6 minutes, accompanied by progressive disappearance of the cervical canal, dilation of the cervix and descent of the fetal presenting part. The first stage of labor is divided into the latent stage and the active stage. The latent stage refers to the period from regular uterine contractions to cervical dilation of less than 5 cm. The active stage refers to the period from cervical dilation of 5 cm to full dilation of the cervix. The second stage of labor is also called the fetal delivery stage, which is the process from full dilation of the cervix to fetal delivery. The second stage of labor for primiparas should not exceed 3 hours if no neuraxial analgesia is performed, and should not exceed 4 hours if neuraxial analgesia is performed; for multiparas, it should not exceed 2 hours if no neuraxial analgesia is performed, and should not exceed 3 hours if neuraxial analgesia is performed. The third stage of labor, also known as the placental delivery period, refers to the entire process from the delivery of the fetus to the delivery of the placenta and fetal membranes, that is, the placental detachment and delivery. It takes 5-15 minutes and should not exceed 30 minutes.

[0003] The usual training for trainee midwives, interns or junior doctors is that the teacher directly examines the vagina of the parturient, and the trainees stand next to the teacher to observe. The pelvic and transvaginal examinations of cervical dilation and fetal head descent are limited by the number of examinations and clinical experience. Repeated practice on parturients will cause discomfort to the parturients themselves and easily lead to medical disputes. The trainees cannot understand the teaching content well. Trainee midwives, interns or junior doctors master the teaching knowledge slowly and are prone to teaching errors. The existing technology does not have simulation teaching aids for the three stages of vaginal delivery of parturients, which cannot allow the teaching teacher to break down the entire process of parturition in detail, and trainee midwives, interns or junior doctors cannot fully experience cervical dilation, fetal head descent and the progress of labor. It is difficult for trainee nurses or junior doctors to quickly master and accumulate clinical experience relying only on the teaching teacher's oral instructions and a small number of practical operations. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a vaginal examination teaching aid for simulating the three stages of vaginal delivery of pregnant women, which is convenient for teaching and explaining the pelvic measurement and the dynamic changes of cervical dilation, fetal head descent, fetal position, etc. in the three stages of delivery. Trainee midwives, trainee doctors or junior doctors can practice and feel the cervical dilation, fetal head descent and fetal position changes for many times, and can accumulate experience and grow rapidly through repeated practice, so as to achieve the purpose of teaching and reducing medical disputes caused by clinical teaching. In order to achieve the above purpose, the technical scheme of the present invention is as follows:

[0005] A teaching mold for vaginal examination of pregnant women, comprising a support body for simulating a parturient's pelvis, an elastic bag body for simulating a parturient's uterus, a mold body for simulating a fetus, and a trumpet-shaped conical hose for simulating a cervical canal; the support body comprises a left support for simulating a left half pelvis, a right support for simulating a right half pelvis, a support rod and a limiting ring for simulating a pregnant woman's lumbar spine; the front end of the left support and the front port of the right support are symmetrically hinged to the bottom of the support rod, respectively, the rear port of the left support and the rear port of the right support are connected by an elastic rubber strip A, a conical outlet for simulating the lower opening of the pelvis is formed between the left support and the right support, and conical rubber blocks for simulating the ischial spine are respectively arranged on both sides of the middle of the conical outlet;

[0006] The bottom of the elastic bag body is inserted into the conical outlet;

[0007] The bottom of the elastic bag body is provided with an outlet simulating the uterine cervix, and the upper part of the elastic bag body is provided with an opening; the lower end of the outlet is provided with a hose A for simulating the vagina of a parturient, the hose A is sleeved on the outer wall of the outlet, and a movable ring is installed at the sleeve; the rings are provided with 11, including a normal cervix and one with a diameter of 1 to 10CM;

[0008] The elastic bag body is provided with a mold body with its head facing downward;

[0009] The mold body comprises a silicone body for simulating the body of a fetus; a groove is provided at the tail of the silicone body, and the position of the groove corresponds to the opening; a support rod for simulating the lumbar vertebrae and skull of a fetus is installed inside the silicone body, one end of the support rod extends to the groove, and the other end is elliptical and extends to the head of the mold body; a flat rubber body for simulating a placenta is installed at the top of the elastic bag body; the middle part of the flat rubber body is connected to the abdomen of the mold body through a hose B;

[0010] The conical hose is placed in the elastic bag body, and the trumpet head of the conical hose is connected to the surface of the top of the mold body; a storage tube is arranged at the bottom of the conical hose.

[0011] As a further technical improvement, a sandwich is formed between the outer wall of the outlet and the inner wall of the hose A, a ring is installed in the sandwich, and a Velcro A is provided at the end of the sandwich; the hose A is provided with a zipper opening corresponding to the position of the ring.

[0012] As a further technical improvement, the storage tube is provided with a lower plate and an upper plate from bottom to top; a spring is installed between the lower plate and the upper plate; the top of the upper plate is connected to a conical hose; a limit block is provided in the storage tube and is placed on the upper side of the upper plate. The diameter of the storage tube is larger than the hose A used to simulate the vagina of a parturient, but the storage tube can slide in the hose A under the action of thrust. When the conical hose is not under pressure, the spring can make the conical hose rise and return to its original state. Before teaching, the conical hose and the storage tube should be placed at the outlet of the elastic bag body first, and the conical hose should not be under pressure.

[0013] As a further technical improvement, a limiting ring is included for fixing the elastic bag body; the top of the support rod is connected to the limiting ring, and the position of the limiting ring corresponds to the conical outlet; the middle of the elastic bag body passes through the limiting ring.

[0014] As a further technical improvement, a cable tie for tying the limiting ring is installed on the outer side of the middle of the elastic bag body; and a Velcro B is provided at the end of the cable tie. The cable tie can effectively fix the position of the elastic bag body, and the elastic bag body will not slide down with the mold body.

[0015] As a further technical improvement, a support plate is included; the bottoms of the left bracket and the right bracket are respectively connected to the support plate through connecting rods.

[0016] As a further technical improvement, a handle is installed at the end of the support rod.

[0017] As a further technical improvement, a clip strip is provided in the middle of the elastic bag body; a clip tooth belt matching the clip strip is provided in the middle of the back of the mold body. The clip strip cooperates with the clip tooth belt to enable the teaching teacher to effectively control the specific sliding distance of the mold body when pushing the mold body, so as to better carry out teaching demonstration.

[0018] As a further technical improvement, the support rod is provided with an arc-shaped support beam connecting the two sides of the limiting ring. The arc-shaped support beam increases the force of the limiting ring.

[0019] Method of use of the present invention:

[0020] S1: The teacher takes out the ring at the outlet. Due to its own elasticity, the outlet is in a closed state. At this time, the bottom of the storage tube will support the closed outlet. The teacher puts his hand into the opening of the elastic bag and slowly pushes the support rod at the groove. The whole mold body begins to slide down slowly. During this process, the conical hose is slowly pushed into the storage tube to simulate the disappearance of the cervical canal in the first stage of labor. At this time, the outlet is still in a closed state. The trainee puts his palm into the hose A and then uses the index finger and middle finger to feel the closed state of the outlet. After the trainee has finished feeling it, The teacher opens the zipper, takes out the conical hose and storage tube through the outlet, and then installs a 1cm diameter ring at the outlet. At this time, due to the support of the ring, the outlet is in an open state. The trainee puts his palm into hose A and uses his index and middle fingers to feel the opening size of the outlet. After the trainee feels it, the teacher replaces the ring with a 2cm diameter ring and asks the trainee to feel it with his index and middle fingers. This is repeated until the ring is replaced with a 10cm diameter ring (the mother's cervix is ​​fully dilated to 10cm). The first stage of labor simulation ends and the second stage of labor simulation begins.

[0021] S2: Since the maximum diameter of the head of the mold body is slightly smaller than 10CM, the teacher can easily push the mold body to continue to slide down until it reaches hose A, and then slowly push the mold body out of hose A. During the process, the teacher can twist the support rod and then twist the head of the mold body to simulate the rotation of the fetal head during delivery, with the occipital part of the mold body being delivered first; when the mold body slides out of hose A, hose B is cut off, the second stage of labor simulation ends, and the third stage of labor simulation begins;

[0022] S3: After the mold body comes out, the flat rubber body is still in the elastic bag. The teacher reaches into the elastic bag and slowly pushes the flat rubber body out of the hose A. The third stage of labor simulation ends.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] 1. The present invention simulates the three stages of delivery by means of a support body simulating the pelvis of a parturient, a transparent elastic bag body simulating the uterus of a parturient and a mold body simulating the fetus to be delivered. Meanwhile, under the guidance of a teaching teacher, trainee midwives, trainee doctors or junior doctors can personally experience and understand the three stages of delivery and have a deeper grasp of the knowledge of midwifery.

[0025] 2. The present invention provides an opening through the elastic bag body for the teaching teacher to reach in and push the mold body, and is provided with an outlet to simulate the uterine os and 10 sizes of rings, so that students can feel the process of simulating the expansion of the uterine os to 10 cm.

[0026] 3. The present invention is divided into a left bracket and a right bracket by a bracket body, the front end of which is hinged and the rear end is connected by an elastic rubber strip A. In the process of pushing the mold body down, it can well simulate the expansion of the cervix and fit the situation of parturient delivery. The trainees are impressed and can better grasp the teaching content.

[0027] 4. The present invention adds a trumpet-shaped conical hose for simulating the cervical canal, and a storage tube is provided under the conical hose. The teaching teacher pushes the mold body in the elastic bag body, and the mold body pushes the conical hose to shrink into the storage tube, simulating the disappearance of the cervical canal in the first stage of labor.

[0028] 5. The present invention provides a tie for tying the limiting ring on the outer side of the elastic bag body, which can effectively fix the position of the elastic bag body, and the elastic bag body will not slide down with the mold body.

[0029] 6. Under normal circumstances, when the cervix of a parturient is dilated to 5 cm, the fetal head can descend to the position of the flat spine. The present invention adds a conical rubber block for simulating the ischial spine, so that in the teaching process, the trainee nurses or junior doctors can better perceive the position of the head of the mold body relative to the conical rubber block (under normal circumstances, when the cervix of a parturient is dilated to 5 cm, the fetal head descends to the position of the ischial spine), and can also intuitively let students experience what is abnormal labor (such as stagnation of fetal head descent). BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0032] Figure 3 It is a schematic structural diagram of the support body of the present invention.

[0033] Figure 4 It is a schematic diagram of the structure of AA of the present invention.

[0034] Figure 5 It is a schematic diagram of the structure of the conical hose and the storage tube of the present invention.

[0035] Figure 6 It is a top view of the limiting ring of the present invention.

[0036] Figure ID:

[0037] 1- bracket body, 11- left bracket, 111- conical outlet, 112- conical rubber block, 12- right bracket, 13- support rod, 14- elastic rubber strip A, 15- limiting ring, 16- connecting rod, 17- support plate, 18- support beam, 2- elastic bag body, 21- outlet, 211- ring, 22- hose A, 221- zipper mouth, 23- cable tie, 24- opening, 25- card strip, 3- mold body, 31- silicone body, 311- groove, 321- handle, 33- support rod, 34- flat rubber body, 35- hose B, 36- toothed belt, 4- conical hose, 41- storage tube, 42- lower plate, 43- upper plate, 44- spring, 45- limiting block. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] Embodiment 1:

[0040] The teaching mold for vaginal examination of pregnant women comprises a support body 1 for simulating the pelvis of a parturient, an elastic bag body 2 for simulating the uterus of a parturient, a mold body 3 for simulating a fetus, and a trumpet-shaped conical hose 4 for simulating the cervical canal; the support body 1 comprises a left support 11 for simulating the left half pelvis, a right support 12 for simulating the right half pelvis, a support rod 13 for simulating the lumbar vertebrae of a parturient, and a limiting ring 15; the front end of the left support 11 and the front port of the right support 12 are symmetrically hinged to the bottom of the support rod 13, respectively, the rear port of the left support 11 and the rear port of the right support 12 are connected by an elastic rubber strip A14, and a conical outlet 111 for simulating the lower opening of the pelvis is formed between the left support 11 and the right support 12, and conical rubber blocks 112 for simulating the ischial spines are respectively arranged on both sides of the middle of the conical outlet 111;

[0041] The bottom of the elastic bag body 2 is inserted into the conical outlet 111;

[0042] The bottom of the elastic bag body 2 is provided with an outlet 21 simulating the uterine cervix, and the upper part of the elastic bag body 2 is provided with an opening 24; the lower end of the outlet 21 is provided with a hose A22 for simulating the vagina of a parturient, and the hose A22 is sleeved on the outer wall of the outlet 21, and a movable ring 211 is installed at the sleeve; there are 11 rings 211, including a normal cervix and one with a diameter of 1 to 10CM;

[0043] The elastic bag body 2 is provided with a mold body 3 with its head facing downwards;

[0044] The mold body 3 includes a silicone body 31 for simulating the body of a fetus; a groove 311 is provided at the tail of the silicone body 31, and the position of the groove 311 corresponds to the opening 24; a support rod 33 for simulating the lumbar vertebrae and skull of a fetus is installed inside the silicone body 31, one end of the support rod 33 extends to the groove 311, and the other end is elliptical and extends to the head of the mold body 3; a flat rubber body 34 for simulating a placenta is installed on the top of the elastic bag body 2; the middle part of the flat rubber body 34 is connected to the abdomen of the mold body 3 through a hose B35;

[0045] The conical hose 4 is placed in the elastic bag 2, and the trumpet head of the conical hose 4 is connected to the surface of the top of the mold body 3; the bottom of the conical hose 4 is provided with a storage tube 41. The elastic bag 2 and the hose A22 are both made of opaque elastic material; before teaching, a layer of lubricating oil can be applied on the surface of the mold body 3 to push the mold body 3 down; the maximum diameter of the head of the mold body 3 is less than 10CM;

[0046] The teaching teacher takes out the ring 211 at the outlet 21. Due to the elasticity of the outlet 21, the outlet 21 is in a closed state. At this time, the bottom of the storage tube 41 will support the closed outlet 21. The teaching teacher puts his hand into the opening 24 of the elastic bag body 2, and slowly pushes the support rod 33 at the groove 311. The entire mold body 3 begins to slide down slowly, and the conical hose 4 is slowly pushed into the storage tube 41 during the process, simulating the disappearance of the cervical canal in the first stage of labor. At this time, the outlet 21 is still in a closed state. The trainee puts his palm into the hose A22, and then uses the index finger and middle finger to feel the closed state of the outlet 21. After the trainee has felt it, the teaching teacher opens the zipper opening 221, then passes through the outlet 21 to take out the conical hose 4 and the storage tube 41, and then installs the ring 211 with a diameter of 1 cm at the outlet 21. At this time, due to the supporting effect of the ring 211, the outlet 21 is in an open state. The trainee puts his palm into the hose A21, and then uses the index finger and middle finger to feel the outlet 21. After the students have felt the size of the opening, the teacher will replace the ring 211 with a diameter of 2 cm and let the students feel it with their index and middle fingers, and so on until the ring 211 with a diameter of 10 cm is replaced (the cervix of the parturient is fully dilated to 10 cm). The first stage of labor simulation is over and the second stage of labor simulation begins. Since the maximum diameter of the head of the mold body 3 is slightly smaller than 10 cm, it is easy for the teacher to push the mold body 3 to continue to slide down until the hose A22, and then slowly push the mold body 3 out of the hose A22. During the process, the teacher can twist the support rod 33 and then twist the head of the mold body 3 to simulate the rotation of the fetal head during delivery, in which the occipital part of the mold body 3 is delivered first. When the mold body 3 slides out of the hose A22, the hose B35 is cut off, the second stage of labor simulation is over, and the third stage of labor simulation begins. After the mold body 3 comes out, the flat rubber body 34 is still in the elastic bag body 2. The teacher reaches into the elastic bag body 2 and pushes the flat rubber body 34 out of the hose A22, and the third stage of labor simulation ends.

[0047] Embodiment 2:

[0048] The difference from Example 1 is that a sandwich is formed between the outer wall of the outlet 21 and the inner wall of the hose A22, a ring 211 is installed in the sandwich, and a Velcro A is provided at the end of the sandwich; the hose A22 is provided with a zipper opening 221 corresponding to the position of the ring 211.

[0049] The working principle of this embodiment is the same as that of Embodiment 1.

[0050] Embodiment 3:

[0051] The difference from Example 1 is that the storage tube 41 is provided with a lower plate 42 and an upper plate 43 from bottom to top; a spring 44 is installed between the lower plate 42 and the upper plate 43; the top of the upper plate 43 is connected to the conical hose 4; a stopper 45 is provided in the storage tube 41 and is placed on the upper side of the upper plate 43. The diameter of the storage tube 41 is larger than the hose A22 used to simulate the vagina of a parturient, but the storage tube 41 can slide in the hose A22 under the action of thrust. When the conical hose 4 is not under pressure, the spring 44 can make the conical hose 4 rise and return to its original state. Before teaching, the conical hose 4 and the storage tube 41 should be placed at the outlet 21 of the elastic bag body 2 first, and the conical hose 4 is not under pressure.

[0052] The working principle of this embodiment is the same as that of Embodiment 1.

[0053] Embodiment 4:

[0054] The difference from Example 1 is that it includes a limiting ring 15 for fixing the elastic bag body 2; the top of the support rod 13 is connected to the limiting ring 15, and the position of the limiting ring 15 corresponds to the conical outlet 111; the middle part of the elastic bag body 2 passes through the limiting ring 15.

[0055] The working principle of this embodiment is the same as that of Embodiment 1.

[0056] Embodiment 5:

[0057] The difference from Example 1 is that a tie 23 for tying the limiting ring 15 is installed on the outer side of the middle of the elastic bag body 2; and a Velcro is provided at the end of the tie 23. The tie 23 can effectively fix the position of the elastic bag body 2, and the elastic bag body 2 will not slide down with the mold body 3.

[0058] The working principle of this embodiment is the same as that of Embodiment 1.

[0059] Embodiment 6:

[0060] The difference from the first embodiment is that a support plate 17 is included; the bottoms of the left bracket 11 and the right bracket 12 are connected to the support plate 17 via connecting rods 16 respectively.

[0061] The working principle of this embodiment is the same as that of Embodiment 1.

[0062] Embodiment 7:

[0063] The difference from the first embodiment is that a handle 321 is installed at the end of the support rod 33 .

[0064] The working principle of this embodiment is the same as that of Embodiment 1.

[0065] Embodiment 8:

[0066] The difference from the first embodiment is that the support rod 13 is provided with an arc-shaped support beam 18 connecting the two sides of the limiting ring 15. The arc-shaped support beam 18 increases the force of the limiting ring 15.

[0067] The working principle of this embodiment is the same as that of Embodiment 1.

[0068] Embodiment 9:

[0069] A sandwich is formed between the outer wall of the outlet 21 and the inner wall of the hose A22, a ring 211 is installed in the sandwich, and a Velcro A is provided at the end of the sandwich; the hose A22 is provided with a zipper opening 221 corresponding to the position of the ring 211;

[0070] A lower plate 42 and an upper plate 43 are installed in the storage tube 41 from bottom to top; a spring 44 is installed between the lower plate 42 and the upper plate 43; the top of the upper plate 43 is connected to the conical hose 4; a limit block 45 is provided in the storage tube 41 and is placed on the upper side of the upper plate 43;

[0071] It includes a limiting ring 15 for fixing the elastic bag body 2; the top of the support rod 13 is connected to the limiting ring 15, and the position of the limiting ring 15 corresponds to the conical outlet 111; the middle of the elastic bag body 2 passes through the limiting ring 15;

[0072] A tie 23 for tying the limiting ring 15 is installed on the outer side of the middle of the elastic bag body 2; the end of the tie 23 is provided with a Velcro B;

[0073] It includes a support plate 17; the bottoms of the left bracket 11 and the right bracket 12 are connected to the support plate 17 through connecting rods 16 respectively;

[0074] A handle 321 is installed at the end of the support rod 33;

[0075] A clip strip 25 is provided in the middle of the elastic bag body 2, and a clip tooth belt 36 matching the clip strip 25 is provided in the middle of the back of the mold body 3. The clip strip 25 cooperates with the clip tooth belt 36 to enable the teaching teacher to effectively control the sliding distance of the mold body 3 when pushing the mold body, so as to better perform teaching demonstration.

[0076] The support rod 13 is provided with an arc-shaped support beam 18 connecting two sides of the limiting ring 15 .

[0077] The working principle of this embodiment is the same as that of Embodiment 1.

[0078] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. The teaching mold for vaginal examination of pregnant women is characterized by: The invention comprises a support body (1) for simulating a pregnant woman's pelvis, an elastic bag body (2) for simulating a pregnant woman's uterus, a mold body (3) for simulating a fetus, and a trumpet-shaped conical hose (4) for simulating a cervical canal; the support body (1) comprises a left support (11) for simulating a left half pelvis, a right support (12) for simulating a right half pelvis, a support rod (13) for simulating a pregnant woman's lumbar spine, and a limiting ring (15); the front end of the left support (11) and the front end of the right support (12) are symmetrically hinged to the bottom of the support rod (13), respectively, the rear end of the left support (11) and the rear end of the right support (12) are connected by an elastic rubber strip A (14), and a conical outlet (111) for simulating the lower opening of the pelvis is formed between the left support (11) and the right support (12), and conical rubber blocks (112) for simulating the ischial spine are respectively provided on both sides of the middle of the conical outlet (111); The bottom of the elastic bag body (2) is inserted into the conical outlet (111); The bottom of the elastic bag body (2) is provided with an outlet (21) for simulating the cervical ostium, and the upper part of the elastic bag body (2) is provided with an opening (24); the lower end of the outlet (21) is provided with a hose A (22) for simulating the vagina of a parturient, and the hose A (22) is sleeved on the outer wall of the outlet (21), and a movable ring (211) is installed at the sleeve joint; 11 rings (211) are provided, including a normal cervix and a ring with a diameter ranging from 1 cm to 10 cm; A mold body (3) with its head facing downward is installed in the elastic bag body (2); The mold body (3) comprises a silicone body (31) for simulating the body of a fetus; a groove (311) is provided at the rear of the silicone body (31), and the position of the groove (311) corresponds to the opening (24); a support rod (33) for simulating the lumbar vertebrae and skull of a fetus is installed in the silicone body (31), one end of the support rod (33) extends to the groove (311), and the other end is elliptical and extends to the head of the mold body (3); a flat rubber body (34) for simulating a placenta is installed at the top of the elastic bag body (2); the middle part of the flat rubber body (34) is connected to the abdomen of the mold body (3) through a hose B (35); The conical hose (4) is placed in the elastic bag body (2), and the trumpet head of the conical hose (4) is connected to the surface of the top of the mold body (3); the bottom of the conical hose (4) is provided with a storage tube (41); A sandwich is formed between the outer wall of the outlet (21) and the inner wall of the hose A (22), a circular ring (211) is installed in the sandwich, and a Velcro A is provided at the end of the sandwich; the hose A (22) is provided with a zipper opening (221) corresponding to the position of the circular ring (211); A lower plate (42) and an upper plate (43) are installed in the storage tube (41) from bottom to top; a spring (44) is installed between the lower plate (42) and the upper plate (43); the top of the upper plate (43) is connected to the conical hose (4); and a limit block (45) is provided in the storage tube (41) and is placed on the upper side of the upper plate (43).

2. The teaching mold for vaginal examination of pregnant women according to claim 1, characterized in that: It comprises a limiting ring (15) for fixing the elastic bag body (2); the top of the support rod (13) is connected to the limiting ring (15), and the position of the limiting ring (15) corresponds to the conical outlet (111); the middle part of the elastic bag body (2) passes through the limiting ring (15).

3. The teaching mold for vaginal examination of pregnant women according to claim 1, characterized in that: A cable tie (23) for tying the limiting ring (15) is installed on the outer side of the middle part of the elastic bag body (2); and a Velcro B is provided at the end of the cable tie (23).

4. The teaching mold for vaginal examination of pregnant women according to claim 1, characterized in that: It comprises a support plate (17); the bottoms of the left support (11) and the right support (12) are respectively connected to the support plate (17) via connecting rods (16).

5. The teaching mold for vaginal examination of pregnant women according to claim 1, characterized in that: A handle (321) is installed at the end of the support rod (33).

6. The teaching mold for vaginal examination of pregnant women according to claim 1, characterized in that: A clamping strip (25) is provided in the middle of the elastic bag body (2); and a clamping tooth belt (36) matching the clamping strip (25) is provided in the middle of the back of the mold body (3).

7. The teaching mold for vaginal examination of pregnant women according to claim 1, characterized in that: The support rod (13) is provided with an arc-shaped support beam (18), and the arc-shaped support beam (18) connects two sides of the limiting ring (15).

8. The method for using the teaching mold for vaginal examination of pregnant women according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: The teaching teacher takes out the ring (211) at the outlet. Due to the elasticity of the outlet (21), the outlet (21) is in a closed state. At this time, the bottom of the storage tube (41) will support the closed outlet (21). The teaching teacher puts his hand into the opening of the elastic bag body (2) and slowly pushes the support rod (33) at the groove (311). The entire mold body (3) begins to slide down slowly. During the process, the conical hose (4) is slowly pushed into the storage tube (41), simulating the disappearance of the cervical canal in the first stage of labor. At this time, the outlet (21) is still in a closed state. The trainee puts his palm into the hose A (22) and then uses the index finger and middle finger to feel the closure of the outlet (21). After the trainee has finished feeling it, the teacher opens the zipper, then passes through the outlet (21) to take out the conical hose (4) and the storage tube (41), and then installs a ring (211) with a diameter of 1 cm at the outlet. At this time, due to the support of the ring (211), the outlet (21) is in an open state. The trainee puts his hand into the hose A (22) and then uses his index finger and middle finger to feel the opening size of the outlet (21). After the trainee has finished feeling it, the teacher replaces it with a ring (211) with a diameter of 2 cm and allows the trainee to feel it with his index finger and middle finger. This is repeated until the ring (211) with a diameter of 10 cm is replaced. The first stage of labor simulation ends and the second stage of labor simulation begins. S2: Since the maximum diameter of the head of the mold body (3) is slightly smaller than 10 cm, the teaching teacher can easily push the mold body (3) to continue to slide down until the hose A (22), and then slowly push the mold body (3) out of the hose A (22). During the process, the teaching teacher can twist the support rod (33) and then twist the head of the mold body (3) to simulate the rotation of the fetal head during delivery, where the occipital part of the mold body (3) is delivered first; when the mold body (3) slides out of the hose A (22), the hose B is cut off, the second stage of labor simulation ends, and the third stage of labor simulation begins; S3: After the mold body (3) comes out, the flat rubber body (34) is still in the elastic bag body (2). The teaching teacher reaches into the elastic bag body (2) and slowly pushes the flat rubber body (34) out of the hose A (22), and the third stage of labor simulation ends.

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