Fetal heart rate monitoring device

Abstract

The invention provides a fetal heart monitoring device which comprises a bed board and a monitoring mechanism, and the monitoring mechanism comprises a moving mechanism and a monitoring assembly. The arc-shaped guide plate is driven by the lifting assembly to move downwards, so that the fixing seat and the bottom face of the monitoring probe are tightly attached to the belly of the pregnant woman, the spring is pressed and contracted, then the mounting seat is held to move in the circumferential direction of the arc-shaped guide plate and the length direction of the bed board, and the monitoring probe can move along the belly of the pregnant woman to find the fetal heart. Elastic stretching of a spring ensures that the bottom face of the monitoring probe is always tightly attached to the belly of a pregnant woman, when the fetal heart is found, a mounting base is fixed through a fixing assembly, then a driving assembly drives a piston to move upwards to drive the spring to move upwards, and when the spring moves upwards and is separated from the top end of a connecting rod at an interval, the mounting base is fixed. The spring cancels the pressure applied to the monitoring probe, and meanwhile, the piston moves upwards to enable the negative pressure cavity to generate negative pressure through the guide pipe, so that the fixed seat is adsorbed and fixed on the belly of the pregnant woman, and the comfort and safety of the device in use are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fetal heart monitoring, and in particular to a fetal heart monitoring device. Background Art

[0002] Fetal heart rate monitoring is a monitoring technology used in obstetrics to assess the health status of the fetus in the uterus. It records the changes in fetal heart rate and uterine contractions in real time, dynamically reflecting the fetus's oxygen supply status and cardiovascular system function in the uterus. It is a key means to identify fetal distress and prevent adverse pregnancy outcomes.

[0003] For example, the Chinese patent application number 202210160375.9 discloses a gynecological fetal heart monitor, including a detection device; the detection device includes a bed; T-shaped blocks are slidably connected to the side walls on both sides of the bed; a U-shaped block is fixed to the top of the T-shaped block; a slider is slidably connected to the inner wall of the U-shaped block, and the slider is fixed to the inner wall of the bottom end of the U-shaped block through a spring; a bolt is threadedly connected to the top of the U-shaped block; a pair of sliders are fixed to the opposite surfaces of a pair of sliders; a first through groove is provided on the fixed plate; the inner wall of the first through groove is slidably connected to the moving block through a sliding member; a detection head is provided in the bottom end of the moving block; a grip column is fixed to the top of the moving block; it can ensure that the detection probe can always remain tightly attached to the pregnant woman's belly when the pregnant woman is breathing, thereby ensuring the accuracy of the measurement.

[0004] Existing fetal heart rate monitoring devices require elastic pressure to press the probe against the pregnant woman's belly during fetal heart rate monitoring to ensure that the probe remains in close contact with the pregnant woman's belly while she breathes. However, prolonged pressure from the probe against the pregnant woman's belly can easily cause discomfort and stimulate uterine contractions, potentially affecting the fetus, reducing the comfort and safety of the device. Therefore, to address the above technical issues, a fetal heart rate monitoring device is proposed. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention proposes a fetal heart monitoring device, which can fix the monitoring probe on the pregnant woman's belly while eliminating the pressure on the monitoring probe, thereby improving the comfort and safety of the device.

[0006] A fetal heart monitoring device includes a bed board and a monitoring mechanism, wherein the monitoring mechanism includes: The moving mechanism includes a sliding seat, an arc-shaped guide plate, a lifting assembly, a mounting seat and a fixing assembly. The sliding seats are slidingly provided on both sides of the bed plate along the length direction thereof. The two ends of the arc-shaped guide plate are respectively slidingly provided on two groups of the sliding seats along the vertical direction and driven to move up and down by the lifting assembly. The mounting seat is slidingly sleeved on the arc-shaped guide plate along the circumference of the arc-shaped guide plate and fixed by the fixing assembly; and The monitoring component includes a fixed seat, a monitoring probe, a piston and a driving component. The monitoring probe is arranged at the bottom end of the fixed seat, and the bottom surface is flush with the bottom end of the fixed seat. A negative pressure chamber is opened at the bottom end of the fixed seat, and a piston chamber is opened at the top end of the mounting seat. The negative pressure chamber and the bottom surface of the piston chamber are connected through a conduit. A connecting rod is passed through the bottom end of the piston chamber along its axial sealing sliding. The bottom end of the connecting rod is connected to the fixed seat. The piston is sealingly slidably arranged in the piston chamber. A spring is provided at the bottom end of the piston. The driving component is used to drive the piston to move so that the bottom end of the spring contacts or is separated from the top end of the connecting rod.

[0007] The beneficial effects of the above-mentioned fetal heart monitoring device are: The arc guide plate is driven downward by the lifting component so that the fixing seat and the bottom surface of the monitoring probe are closely fitted with the pregnant woman's belly and the spring is compressed and contracted. The mounting seat is then held and moved along the circumference of the arc guide plate and the length direction of the bed board, so that the monitoring probe can be moved along the pregnant woman's belly to search for the fetal heart rate. At this time, the elastic expansion and contraction of the spring ensures that the bottom surface of the monitoring probe is always closely fitted with the pregnant woman's belly. When the fetal heart rate is found, the mounting seat is fixed by the fixing component, and then the driving component drives the piston upward. The upward movement of the piston drives the spring upward. When the spring moves upward and is separated from the top end of the connecting rod, the spring cancels the pressure applied to the monitoring probe. At the same time, the upward movement of the piston can generate negative pressure in the negative pressure chamber through the catheter, so that the fixing seat is adsorbed and fixed on the pregnant woman's belly. The pressure on the monitoring probe is canceled and the monitoring probe can be fixed on the pregnant woman's belly, thereby ensuring that the monitoring probe can always be closely fitted with the pregnant woman's belly when the pregnant woman breathes, and no additional pressure is applied to the pregnant woman's belly, thereby improving the comfort and safety of the device.

[0008] In one embodiment, the drive assembly includes a first screw; the first screw is rotatably disposed at the top end of the piston cavity and axially disposed along the piston cavity, and the first screw is threadably connected to the piston.

[0009] In one embodiment, the fixing assembly includes a fixing block, a second screw and an internal threaded sleeve; the fixing block is slidably arranged on the mounting seat and can abut against the peripheral side of the arc-shaped guide plate, the second screw is arranged at the top of the fixing block and is arranged parallel to the first screw, and the internal threaded sleeve is rotatably arranged on the mounting seat and is threadedly connected to the second screw.

[0010] In one embodiment, two sets of guide shafts are arranged opposite to each other on the mounting seat, and both ends of the fixing block are slidably arranged on the two sets of guide shafts.

[0011] In one embodiment, the fixing assembly further includes a linkage assembly, which connects the first screw and the internal threaded sleeve. The rotation of the first screw can drive the internal threaded sleeve to rotate in the opposite direction through the linkage assembly, so that when the spring is separated from the top end of the connecting rod, the fixing block abuts against the peripheral side of the arc-shaped guide plate.

[0012] In one embodiment, the linkage assembly includes gears, and the gears are coaxially provided on the first screw and the internal threaded sleeve, and the two sets of gears are meshed.

[0013] In one embodiment, T-shaped grooves are provided on both sides of the bed board, and T-shaped sliders are provided on the two groups of sliding seats. The two groups of T-shaped sliders are slidably provided in the two groups of T-shaped grooves along the length direction of the bed board.

[0014] In one embodiment, the lifting assembly includes a third screw; limiting grooves are provided on both groups of the sliding seats, and both ends of the arc guide plate are slidably arranged in the two groups of limiting grooves along the vertical direction. The third screw is arranged in the vertical direction and is rotatably arranged in one group of the limiting grooves and is threadedly connected to the arc guide plate.

[0015] In one embodiment, two groups of elastic sealing rings are provided at the bottom end of the fixing seat, and the two groups of elastic sealing rings are respectively located at the inner side and the outer side of the bottom end of the negative pressure chamber.

[0016] In one embodiment, a positioning groove is formed at the top end of the connecting rod, and the bottom end of the spring can contact the bottom surface of the positioning groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention, the following briefly introduces the drawings required for use in the specific embodiments. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a fetal heart monitoring device provided by one embodiment of the present invention; Figure 2 for Figure 1 An exploded view of a fetal heart monitoring device shown in partial section; Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of a monitoring component in a fetal heart monitoring device is shown; Figure 4 for Figure 1 An exploded view of a monitoring component in a fetal heart monitoring device is shown; Figure 5 for Figure 4A magnified schematic diagram of area A; Figure 6 for Figure 1 An exploded view of a fixed component in a fetal heart monitoring device is shown.

[0019] Reference numerals: 1. Bed board; 11. T-shaped slide; 10. Sliding seat; 101. Arc guide plate; 102. Mounting seat; 103. T-shaped slider; 104. Limiting slide; 105. Guide shaft; 20. Fixing seat; 201. Monitoring probe; 202. Piston; 2021. Positioning slider; 203. Negative pressure chamber; 204. Piston chamber; 2041. Positioning slide; 205. Conduit; 206. Connecting rod; 2061. Positioning groove; 207. Spring; 208. First screw; 30. Fixed block; 301. Second screw; 302. Internal threaded sleeve; 303. Gear; 40. The third screw; 50. Elastic sealing ring. DETAILED DESCRIPTION

[0020] The following embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0021] See also Figures 1 to 4 In one embodiment, a fetal heart monitoring device includes a bed board 1 and a monitoring mechanism, and the monitoring mechanism includes a moving mechanism and a monitoring component.

[0022] Specifically, the moving mechanism includes a sliding seat 10, an arc-shaped guide plate 101, a lifting assembly, a mounting seat 102 and a fixed assembly. Sliding seats 10 are provided on both sides of the bed board 1 for sliding along its length direction. The two ends of the arc-shaped guide plate 101 are respectively slidably provided on two groups of sliding seats 10 along the vertical direction, and are driven to rise and fall by the lifting assembly. The mounting seat 102 is circumferentially slidably sleeved on the arc-shaped guide plate 101 and is fixed by a fixed assembly. The monitoring assembly includes a fixed seat 20, a monitoring probe 201, a piston 202 and a driving assembly. The monitoring probe 201 is arranged at the bottom end of the fixed seat 20, and the bottom surface is flush with the bottom end of the fixed seat 20. A negative pressure chamber 203 is opened at the bottom end of the fixed seat 20, and a piston chamber 204 is opened at the top end of the mounting seat 102. The negative pressure chamber 203 and the bottom surface of the piston chamber 204 are connected through a conduit 205. The bottom end of the piston chamber 204 is sealed and slidably penetrated by a connecting rod 206 along its axial direction. The bottom end of the connecting rod 206 is connected to the fixed seat 20. The piston 202 is sealed and slidably arranged in the piston chamber 204. A spring 207 is provided at the bottom end of the piston 202. The driving assembly is used to drive the piston 202 to move so that the bottom end of the spring 207 contacts or is separated from the top end of the connecting rod 206.

[0023] In the above embodiment, the arc guide plate 101 is driven downward by the lifting component so that the fixing seat 20 and the bottom surface of the monitoring probe 201 are in close contact with the pregnant woman's belly, the bottom opening of the negative pressure chamber 203 is sealed by the pregnant woman's belly, and the spring 207 is squeezed by the connecting rod 206 so that the spring 207 is compressed and contracted, and then the mounting seat 102 is held and moved along the circumference of the arc guide plate 101 and the length direction of the bed board 1, so that the monitoring probe 201 can be moved along the pregnant woman's belly to search for the fetal heart rate. At this time, the elastic expansion and contraction of the spring 207 ensures that the bottom surface of the monitoring probe 201 is always in close contact with the pregnant woman's belly. When the fetal heart rate is found, the mounting seat 102 is fixed by the fixing component, and then the piston 202 is driven upward by the driving component. The piston 202 moves upward The spring 207 is driven to move upward. When the spring 207 moves upward and is separated from the top end of the connecting rod 206, the spring 207 cancels the pressure applied to the connecting rod 206, thereby canceling the pressure applied to the monitoring probe 201. At the same time, the piston 202 moves upward to generate negative pressure in the negative pressure chamber 203 through the catheter 205, so that the fixing seat 20 is adsorbed and fixed on the pregnant woman's belly, and then the monitoring probe 201 is fixed on the pregnant woman's belly. The pressure on the monitoring probe 201 is canceled and the monitoring probe 201 can be fixed on the pregnant woman's belly, thereby ensuring that the monitoring probe 201 can always fit closely with the pregnant woman's belly when the pregnant woman breathes, and no additional pressure is applied to the pregnant woman's belly, thereby improving the comfort and safety of the device.

[0024] See also Figure 3 and Figure 4In one embodiment, the drive assembly includes a first screw 208 ; the first screw 208 is rotatably disposed at the top of the piston cavity 204 and axially disposed along the piston cavity 204 , and the first screw 208 is threadedly connected to the piston 202 .

[0025] In the above embodiment, the piston 202 can be driven to move upward by rotating the first screw 208 and engaging with the piston 202 thread, and the piston 202 can be driven to move downward by rotating the first screw 208 and engaging with the piston 202 thread in the opposite direction. It is convenient to drive the piston 202 to move, and when the rotation of the first screw 208 is stopped, the first screw 208 and engaging with the piston 202 thread can fix the piston 202, which is convenient to fix the piston 202.

[0026] Furthermore, two sets of positioning sliders 2021 are disposed on opposite sides of the piston 202, and two sets of positioning grooves 2041 are disposed on opposite sides of the piston cavity 204. The two sets of positioning sliders 2021 slide in the two sets of positioning grooves 2041. This improves the sliding stability of the piston 202 and prevents the piston 202 from rotating when the first screw 208 rotates.

[0027] See also Figure 3 、 Figure 4 and Figure 6 In one embodiment, the fixing assembly includes a fixing block 30, a second screw 301 and an internal threaded sleeve 302; the fixing block 30 is slidably set on the mounting seat 102 and can abut against the circumferential side of the arc guide plate 101, the second screw 301 is set at the top of the fixing block 30 and is arranged parallel to the first screw 208, and the internal threaded sleeve 302 is rotatably set on the mounting seat 102 and is threadedly connected to the second screw 301.

[0028] When the fixing block 102 is unlocked, the fixing block 102 is unlocked, and the fixing block 102 is unlocked.

[0029] Specifically in the above embodiment, two sets of guide shafts 105 are disposed opposite each other on the mounting base 102, and both ends of the fixing block 30 are slidably mounted on the two sets of guide shafts 105. The two sets of guide shafts 105 guide the sliding of the fixing block 30, thereby improving the stability of the fixing block 30 during sliding and preventing the second screw 301 from rotating when the internally threaded sleeve 302 rotates.

[0030] See also Figure 3 、 Figure 4 and Figure 6 In one embodiment, the fixing assembly further includes a linkage assembly that connects the first screw 208 and the internally threaded sleeve 302. Rotation of the first screw 208 drives the internally threaded sleeve 302 to rotate in the opposite direction via the linkage assembly, so that when the spring 207 is spaced apart from the top end of the connecting rod 206, the fixing block 30 abuts against the circumference of the arcuate guide plate 101. Specifically, the linkage assembly includes a gear 303. The gears 303 are coaxially disposed on the first screw 208 and the internally threaded sleeve 302, and the two sets of gears 303 mesh with each other.

[0031] In the above embodiment, the first screw 208 rotates and engages with the piston 202 thread to drive the piston 202 to move upward. At the same time, the first screw 208 rotates and engages with the two sets of gears 303 to drive the internal threaded sleeve 302 to rotate in the opposite direction relative to the first screw 208. At this time, the internal threaded sleeve 302 rotates and engages with the fixed block 30 thread to drive the fixed block 30 to move downward. After the piston 202 moves upward and drives the spring 207 to move upward and separate from the top end of the connecting rod 206, the fixed block 30 moves downward and abuts against the side of the arc guide plate 101, thereby eliminating the pressure applied to the monitoring probe 201 and fixing the mounting base 102. It is convenient to use and saves effort, and simplifies the operating steps.

[0032] See also Figure 1 and Figure 2 In one embodiment, T-shaped slots 11 are formed on both sides of the bed board 1. T-shaped sliders 103 are provided on both sets of sliding seats 10. Both sets of T-shaped sliders 103 slide along the length of the bed board 1 within the two sets of T-shaped slots 11. The cooperation between the T-shaped sliders 103 and the T-shaped slots 11 improves the stability of the sliding seats 10 along the length of the bed board 1, thereby improving the stability of the entire device along the length of the bed board 1.

[0033] See also Figure 1 and Figure 2 In one embodiment, the lifting assembly includes a third screw 40; both sets of sliding seats 10 are provided with limiting slide grooves 104, and both ends of the arc guide plate 101 are slidably arranged in the two sets of limiting slide grooves 104 along the vertical direction. The third screw 40 is arranged in the vertical direction and is rotatably arranged in one set of limiting slide grooves 104 and is threadedly connected to the arc guide plate 101.

[0034] In the above embodiments, the arc guide plate 101 can be driven to move upward by rotating the third screw 40 and engaging with the thread of the arc guide plate 101, and the arc guide plate 101 can be driven to move downward by rotating the third screw 40 and engaging with the thread of the arc guide plate 101 in the opposite direction, which makes it convenient to drive the arc guide plate 101 to be raised and lowered, and the arc guide plate 101 can be fixed by stopping the rotation of the third screw 40 and engaging with the thread of the arc guide plate 101, which makes it convenient to fix the arc guide plate 101.

[0035] See also Figure 4 and Figure 5 In one embodiment, two sets of elastic sealing rings 50 are provided at the bottom end of the fixing seat 20 , and the two sets of elastic sealing rings 50 are respectively located at the inner side and the outer side of the bottom end of the negative pressure chamber 203 .

[0036] In the above embodiment, the elastic sealing ring 50 can further improve the sealing performance of the contact between the negative pressure chamber 203 and the pregnant woman's belly, thereby avoiding air leakage when the negative pressure chamber 203 negatively absorbs the pregnant woman's belly, thereby improving the firmness of the fixing seat 20 adsorbed and fixed on the pregnant woman's belly, and further ensuring that the monitoring probe 201 can always fit tightly against the pregnant woman's belly.

[0037] See also Figure 4 In one embodiment, a positioning groove 2061 is formed at the top of the connecting rod 206, and the bottom end of the spring 207 can contact the bottom surface of the positioning groove 2061. The positioning groove 2061 can limit the spring 207 when the spring 207 contracts, thereby preventing the spring 207 from deflecting due to contraction.

[0038] The specific implementation of the above-mentioned fetal heart monitoring device is as follows: The pregnant woman lies on the bed board 1 with her belly under the monitoring probe 201. Then, the third screw 40 is rotated to engage with the thread of the arc guide plate 101 to drive the arc guide plate 101 to move downward. The downward movement of the arc guide plate 101 drives the monitoring probe 201 to move downward until the monitoring probe 201 is in close contact with the pregnant woman's belly. The bottom opening of the negative pressure chamber 203 is sealed by the pregnant woman's belly, and the spring 207 is squeezed by the connecting rod 206 so that the spring 207 is compressed and contracted. Then, the mounting seat 102 is held and moved along the circumference of the arc guide plate 101 and the length direction of the bed board 1, so that the monitoring probe 201 can be moved along the pregnant woman's belly to search for the fetal heart rate. At this time, the elastic expansion and contraction of the spring 207 ensures that the bottom surface of the monitoring probe 201 is always in close contact with the pregnant woman's belly.

[0039] When the fetal heart is found, the piston 202 is driven to move upward by rotating the first screw 208 and the piston 202 threadedly cooperate. The upward movement of the piston 202 drives the spring 207 to move upward. When the spring 207 moves upward and is separated from the top of the connecting rod 206, the spring 207 cancels the pressure applied to the connecting rod 206, thereby canceling the pressure applied to the monitoring probe 201. At the same time, the upward movement of the piston 202 can generate a negative pressure in the negative pressure chamber 203 through the catheter 205, so that the fixing seat 20 is adsorbed and fixed on the pregnant woman's belly, and then the monitoring probe 201 is fixed on the pregnant woman's belly. The pressure on the monitoring probe 201 is canceled while the monitoring probe 201 is fixed on the pregnant woman's belly, thereby ensuring that the pregnant woman is During breathing, the monitoring probe 201 can always fit tightly against the pregnant woman's belly without exerting additional pressure on the pregnant woman's belly, thereby improving the comfort and safety of the device. The first screw 208 rotates to engage with the two sets of gears 303 to drive the internal threaded sleeve 302 to rotate in the opposite direction relative to the first screw 208. At this time, the internal threaded sleeve 302 rotates and engages with the thread of the fixed block 30 to drive the fixed block 30 to move downward. After the piston 202 moves upward to drive the spring 207 to move upward and separate from the top end of the connecting rod 206, the fixed block 30 moves downward and abuts against the side of the arc guide plate 101, thereby eliminating the pressure exerted on the monitoring probe 201 and fixing the mounting base 102 at the same time. It is convenient to use and saves effort, and simplifies the operating steps.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A fetal heart monitoring device, characterized in that: It comprises a bed board (1) and a monitoring mechanism, wherein the monitoring mechanism comprises: A moving mechanism, comprising a sliding seat (10), an arc-shaped guide plate (101), a lifting assembly, a mounting seat (102) and a fixing assembly, wherein the sliding seats (10) are slidably provided on both sides of the bed plate (1) along the length direction thereof, the two ends of the arc-shaped guide plate (101) are respectively slidably provided on two groups of the sliding seats (10) along the vertical direction, and are driven to move up and down by the lifting assembly, and the mounting seat (102) is slidably sleeved on the arc-shaped guide plate (101) along the circumference of the arc-shaped guide plate (101) and is fixed by the fixing assembly; and A monitoring assembly comprises a fixing seat (20), a monitoring probe (201), a piston (202) and a driving assembly, wherein the monitoring probe (201) is arranged at the bottom end of the fixing seat (20), and the bottom surface is flush with the bottom end of the fixing seat (20), a negative pressure cavity (203) is provided at the bottom end of the fixing seat (20), a piston cavity (204) is provided at the top end of the mounting seat (102), and the negative pressure cavity (203) and the bottom surface of the piston cavity (204) are connected via a conduit (205). The bottom end of the piston cavity (204) is sealed and slidably penetrated by a connecting rod (206) along its axial direction, the bottom end of the connecting rod (206) is connected to the fixed seat (20), the piston (202) is sealed and slidably arranged in the piston cavity (204), the bottom end of the piston (202) is provided with a spring (207), and the driving assembly is used to drive the piston (202) to move so that the bottom end of the spring (207) is in contact with or spaced apart from the top end of the connecting rod (206).

2. A fetal heart monitoring device according to claim 1, characterized in that: The driving assembly includes a first screw (208); the first screw (208) is rotatably arranged at the top end of the piston cavity (204) and is axially arranged along the piston cavity (204); the first screw (208) is threadedly connected to the piston (202).

3. A fetal heart monitoring device according to claim 2, characterized in that: The fixing assembly comprises a fixing block (30), a second screw (301) and an internal threaded sleeve (302); the fixing block (30) is slidably arranged on the mounting seat (102) and can abut against the circumferential side of the arc-shaped guide plate (101); the second screw (301) is arranged at the top end of the fixing block (30) and is arranged parallel to the first screw (208); the internal threaded sleeve (302) is rotatably arranged on the mounting seat (102) and is threadedly connected to the second screw (301).

4. A fetal heart monitoring device according to claim 3, characterized in that: Two sets of guide shafts (105) are arranged relatively on the mounting seat (102), and both ends of the fixing block (30) are slidably arranged on the two sets of guide shafts (105).

5. A fetal heart monitoring device according to claim 3, characterized in that: The fixing assembly further includes a linkage assembly, wherein the linkage assembly connects the first screw rod (208) and the internal threaded sleeve (302), and the rotation of the first screw rod (208) can drive the internal threaded sleeve (302) to rotate in the opposite direction through the linkage assembly, so that when the spring (207) is spaced apart from the top end of the connecting rod (206), the fixing block (30) abuts against the circumferential side of the arc-shaped guide plate (101).

6. A fetal heart monitoring device according to claim 5, characterized in that: The linkage assembly includes a gear (303), and the gear (303) is coaxially provided on the first screw (208) and the internal threaded sleeve (302), and the two sets of gears (303) are meshed.

7. A fetal heart monitoring device according to claim 1, characterized in that: Both sides of the bed board (1) are provided with T-shaped slide grooves (11), and both sets of the sliding seats (10) are provided with T-shaped sliders (103). Both sets of the T-shaped sliders (103) are slidably arranged in the two sets of the T-shaped slide grooves (11) along the length direction of the bed board (1).

8. The fetal heart monitoring device according to claim 1, characterized in that: The lifting assembly includes a third screw (40); both sets of the sliding seats (10) are provided with a limiting slide groove (104), and both ends of the arc guide plate (101) are slidably arranged in the two sets of the limiting slide grooves (104) along the vertical direction. The third screw (40) is arranged in the vertical direction and is rotatably arranged in one set of the limiting slide grooves (104) and is threadedly connected to the arc guide plate (101).

9. The fetal heart monitoring device according to claim 1, characterized in that: Two groups of elastic sealing rings (50) are provided at the bottom end of the fixing seat (20), and the two groups of elastic sealing rings (50) are respectively located on the inner side and the outer side of the bottom end of the negative pressure chamber (203).

10. The fetal heart monitoring device according to claim 1, characterized in that: A positioning groove (2061) is provided at the top end of the connecting rod (206), and the bottom end of the spring (207) can contact the bottom surface of the positioning groove (2061).

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