Portable fetus-voice meter with noise reduction function
By using the extrusion and rolling mechanism design of the portable fetal heart rate monitor, the problem of coupling agent flow is solved, achieving uniform coating and recycling, improving the efficiency and comfort of fetal heart rate detection, reducing external noise interference, and improving detection accuracy.
Patent Information
- Application Number
- CN202511029138.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-25
- Publication Date
- 2025-10-31
AI Technical Summary
During the use of existing fetal heart rate monitors, the coupling agent tends to flow, affecting the application effect and increasing the difficulty of cleaning. Furthermore, traditional coupling agents may cause discomfort to pregnant women.
A portable fetal heart rate monitor was designed, comprising a squeezing mechanism, a covering mechanism, and a rolling mechanism. The covering mechanism creates a blocking space to restrict the flow of coupling agent, while the rolling mechanism achieves uniform coating and recycling. Combined with a heating element, the coupling agent temperature is kept at a suitable level, improving user comfort.
It effectively limits the flow of coupling agent, improves application efficiency and ease of cleaning, enhances user experience and detection accuracy, reduces external noise interference, and increases the comfort of pregnant women.
Smart Images
Figure CN120859548A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fetal heart rate monitoring technology, and more specifically, to a portable fetal heart rate monitor with noise reduction function. Background Technology
[0002] Existing fetal heart rate monitors, also known as fetal heart rate monitors, obtain fetal heart movement information from the pregnant woman's abdomen based on the Doppler principle. They are not used for continuous monitoring, but only for obtaining fetal heart movement information. They are mainly electronic instruments used for fetal heart monitoring. The new generation of intelligent fetal heart rate monitors includes the functions of traditional fetal heart rate monitors and meets the standards for home fetal heart monitoring. During the process of listening to the fetal heartbeat, a coupling agent is usually used. It is applied to the pregnant woman's belly and used in conjunction with the instrument. The main function of the coupling agent is to eliminate the air gap between the ultrasound probe and the skin, ensuring that the ultrasound waves can be transmitted smoothly and effectively, thereby improving the accuracy of fetal heart rate detection.
[0003] After the coupling agent is squeezed out and applied to the pregnant woman's belly, as the fetal heart monitor moves across the surface, the probe pushes the coupling agent, causing it to accumulate and flow down the belly towards areas with less coupling agent. This flow is quite noticeable, disrupting the application process and affecting the effectiveness of the coupling agent application. It also spreads excess coupling agent over a wider area, making subsequent cleaning more tedious and difficult. Summary of the Invention
[0004] This invention provides a portable fetal heart rate monitor with noise reduction function, which solves the technical problem in related technologies that coupling agent is easily squeezed onto the pregnant woman's protruding belly and flows out, affecting the application and increasing the difficulty of cleaning.
[0005] This invention provides a portable fetal heart rate monitor with noise reduction function, including a fetal heart rate monitor body, a squeezing mechanism, a covering mechanism and a rolling mechanism; The squeezing mechanism is located on the outer periphery of the fetal heart rate monitor body, and the covering mechanism covers the belly to form a covering space; The number of the rolling mechanism is two sets, and the two sets of rolling mechanisms are symmetrically arranged with respect to the main body of the fetal heart rate monitor. The rolling mechanism is connected to the extrusion mechanism and is located within the enclosure space. The extrusion mechanism is provided with a deformation space for storing the coupling agent. When in use, the deformation space becomes smaller and the coupling agent is squeezed into the rolling mechanism. As the main body of the fetal heart rate monitor moves downward, the covering space becomes smaller, and the rolling mechanism spreads out from the middle to both sides to coat the coupling agent. When the main body of the fetal heart rate monitor moves back, the covering space increases to absorb the coupling agent at the edge of the covering. At the same time, the deformation space increases, the rolling mechanism moves back and closes, and collects the coupling agent.
[0006] As a further optimization of the present invention, the extrusion mechanism includes an annular cylinder, a movable sleeve, and a movable ring. The annular cylinder is fixedly fitted on the outer periphery of the fetal heart rate monitor body, and the movable ring is slidably fitted inside the annular cylinder and fixedly connected to the movable sleeve.
[0007] As a further optimization of the present invention, a push handle is installed on the movable sleeve, and there is a gap between the push handle and the main body of the fetal heart rate monitor.
[0008] As a further optimization of the present invention, the covering mechanism includes a movable shell and a cover frame. The cover frame is fixedly fitted on the outer periphery of the annular cylinder. The wall of the cover frame has an upwardly opening cavity. The movable shell slides into the cavity and is connected to a return member. The bottom of the inner periphery of the cover frame has a through hole communicating with the cavity.
[0009] As a further optimization of the present invention, the return component includes a guide rod and a return spring. One end of the guide rod is connected to the inner wall of the cavity, and the other end slides into the interior of the movable shell. The return spring is movably sleeved on the outer periphery of the guide rod, and one end of the return spring is connected to the inner wall of the cavity, and the other end is connected to the movable shell.
[0010] As a further optimization of the present invention, the bottom of the cover frame is rotatably fitted with multiple balls, which are evenly distributed.
[0011] As a further optimization of the present invention, the rolling mechanism includes a rotating tube, a hollow rod, a torsion spring, and a rotating joint. One end of the hollow rod is rotatably connected to the annular cylinder through the rotating joint, and the other end of the hollow rod is rotatably connected to the rotating tube. The rotating tube has a hole. The torsion spring is movably sleeved on the outer periphery of the rotating joint. One end of the torsion spring is connected to the hollow rod, and the other end is connected to the annular cylinder.
[0012] As a further optimization of the present invention, both the movable shell and the cover frame are made of transparent material.
[0013] As a further optimization of the present invention, a heating element is embedded inside the deformation space and is arranged in a ring.
[0014] The beneficial effects of this invention are as follows: 1. The portable fetal heart rate monitor with noise reduction function described in this invention has a cover mechanism that forms a barrier area by pre-contacting the belly. When applying the coupling agent, it creates a blocking space, effectively limiting the flow of the coupling agent to a larger area, greatly reducing the difficulty of subsequent cleaning for pregnant women, and significantly improving the user experience. At the same time, the cover mechanism forms a physical cover for the main probe of the fetal heart rate monitor, which can reduce the interference of external noise on the detection process and further optimize the fetal heart signal acquisition environment.
[0015] 2. The portable fetal heart rate monitor with noise reduction function described in this invention achieves the coating and convenient recycling of coupling agent through the combined use of a rolling mechanism and a covering mechanism. During the detection process, the rolling mechanism can evenly coat the coupling agent onto the pregnant woman's belly. After coating, the detection can be performed directly, avoiding the problems of uneven or incomplete manual application. At the same time, after the detection is completed, the covering mechanism and the rolling mechanism work together to absorb the excess coupling agent on the belly, reducing the waste of coupling agent and the difficulty of cleaning. In addition, the symmetrical distribution of the rolling mechanism further improves the efficiency of coupling agent coating and recycling, making the entire detection process smoother and more efficient, and significantly improving the convenience of operation and user experience.
[0016] 3. The portable fetal heart rate monitor with noise reduction function described in this invention has a heating element embedded inside an annular cylinder, which can heat the coupling agent inside the annular cylinder to keep its temperature within a suitable range close to human body temperature. On the one hand, it can avoid the irritation caused by traditional low-temperature coupling agents contacting the pregnant woman's belly, significantly improving the pregnant woman's testing comfort. On the other hand, the coupling agent has increased fluidity after heating, making it easier to evenly coat the belly surface through a rolling mechanism, reducing problems such as high viscosity and uneven application caused by low temperature, thereby improving the accuracy of fetal heart rate detection. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of a portable fetal heart rate monitor with noise reduction function proposed in this invention.
[0018] Figure 2 This is a cross-sectional view of the movable shell and cover frame in a portable fetal heart rate monitor with noise reduction function proposed in this invention.
[0019] Figure 3 This is a schematic diagram of the internal structure of the cover frame in a portable fetal heart rate monitor with noise reduction function proposed in this invention.
[0020] Figure 4 This is a cross-sectional schematic diagram of the annular cylinder in a portable fetal heart rate monitor with noise reduction function proposed in this invention.
[0021] Figure 5 This is a schematic diagram of the internal structure of the annular cylinder in a portable fetal heart rate monitor with noise reduction function proposed in this invention.
[0022] Figure 6 This is a schematic diagram of the outflow structure of the coupling agent in a portable fetal heart rate monitor with noise reduction function proposed in this invention.
[0023] In the picture: 1. Main body of the fetal heart rate monitor; 2. Extrusion mechanism; 21. Annular cylinder; 22. Moving sleeve; 23. Moving ring; 24. Push handle; 3. Covering mechanism; 31. Moving shell; 32. Cover frame; 321. Cavity; 322. Through hole; 33. Guide rod; 34. Return spring; 35. Ball bearing; 4. Rolling mechanism; 41. Rotary tube; 42. Hollow rod; 43. Torsion spring; 44. Rotary joint. Detailed Implementation
[0024] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.
[0025] like Figure 1 , Figure 2 and Figure 4 As shown in the figure, a portable fetal heart rate monitor with noise reduction function according to an embodiment of the present invention includes a fetal heart rate monitor body 1, a squeezing mechanism 2, a covering mechanism 3 and a rolling mechanism 4. The squeezing mechanism 2 is set on the outer periphery of the fetal heart rate monitor body 1, and the covering mechanism 3 is covered on the belly to form a covering space; There are two sets of rolling mechanisms 4, which are symmetrically arranged around the main body 1 of the fetal heart rate monitor. The rolling mechanism 4 is connected to the extrusion mechanism 2 and is located in the enclosure space. The extrusion mechanism 2 is provided with a deformation space for storing the coupling agent. When in use, the deformation space becomes smaller and the coupling agent is squeezed into the rolling mechanism 4. As the fetal heart rate monitor body 1 moves downward, the covering space becomes smaller, and the rolling mechanism 4 spreads out from the middle to both sides to coat the coupling agent. When the main body 1 of the fetal heart rate monitor moves back, the covering space increases to absorb the coupling agent at the edge of the covering. At the same time, the deformation space increases, the rolling mechanism 4 moves back and closes, and collects the coupling agent.
[0026] The rolling mechanism 4 has a first position state and a second position state; In the first position state, the covering mechanism 3 covers the belly area to be tested. At this time, the squeezing mechanism 2 provides coupling agent to the rolling mechanism 4. The rolling mechanism 4 performs a rolling operation on the belly surface to coat the coupling agent onto the belly until the probe of the fetal heart monitor body 1 is in contact with the belly to carry out fetal heart detection. In the second position state, the probe of the fetal heart rate monitor body 1 separates from the belly. At the same time, the covering mechanism 3 absorbs the coupling agent covering the edge of the belly. Meanwhile, the rolling mechanism 4 absorbs the coupling agent already coated on the belly during the return process.
[0027] The fetal heart rate monitor body 1 has a squeezing mechanism 2 on its outer periphery and contains coupling agent inside. The rolling mechanism 4 is connected to the squeezing mechanism 2 and is located inside the covering mechanism 3. It has two position states. During the test, the covering mechanism 3 covers the belly, the squeezing mechanism 2 delivers coupling agent to the rolling mechanism 4, and the rolling mechanism 4 rolls and coats the coupling agent so that the probe fits the belly for the test. After the test is completed, the probe is separated, the covering mechanism 3 picks up the edge coupling agent, and the rolling mechanism 4 moves back to pick up the coated coupling agent.
[0028] The coupling agent range is limited by the covering mechanism 3, and the rolling mechanism 4 achieves uniform coating and recycling of the coupling agent, solving the problem of coupling agent flow, improving coating efficiency and cleaning convenience. All components work together to complete the coating and recycling of coupling agent before and after testing.
[0029] like Figures 2 to 5 As shown, the extrusion mechanism 2 includes an annular cylinder 21, a movable sleeve 22, and a movable ring 23. The annular cylinder 21 is fixedly fitted around the outer periphery of the fetal heart rate monitor body 1 and forms an annular opening upwards. The movable ring 23 is slidably fitted inside the annular cylinder 21 and is fixedly connected to the movable sleeve 22. A heating element (not shown in the figure) is embedded inside the annular cylinder 21. The heating element is a closed annular arrangement and is a heating plate. When the heating element is energized, it generates heat to heat the coupling agent inside the annular cylinder 21, raising the temperature of the coupling agent and maintaining it within a suitable range close to the human body temperature. The temperature of the heated coupling agent is suitable, avoiding irritation when the low-temperature coupling agent comes into contact with the pregnant woman's belly, thus improving the comfort of the pregnant woman.
[0030] When in use, the interior of the annular cylinder 21 is pre-filled with coupling agent in the deformation space, and the coupling agent is filled at the bottom of the annular cylinder 21. The movable sleeve 22 is mostly located inside the annular cylinder 21 to facilitate the subsequent collection of the coupling agent after use. That is, the movable sleeve 22 reduces the portion located inside the annular cylinder 21.
[0031] The annular cylinder 21 is fixed to the outer periphery of the fetal heart rate monitor body 1, and the movable ring 23 is slidably sleeved inside. The movable ring 23 is fixedly connected to the movable sleeve 22. Pushing the movable sleeve 22 causes the movable ring 23 to slide inside the annular cylinder 21, squeezing the coupling agent inside the annular cylinder 21 and delivering it to the rolling mechanism 4. Through the sliding cooperation between the movable sleeve 22 and the movable ring 23, the extrusion control of the coupling agent is realized.
[0032] Furthermore, a push handle 24 is installed on the movable sleeve 22, and there is a gap between the push handle 24 and the main body 1 of the fetal heart rate monitor. The push handle 24 is provided with anti-slip texture.
[0033] A push handle 24 is installed on the movable sleeve 22. The anti-slip texture on the push handle 24 increases the friction between the hand and the push handle 24. The operator holds the push handle 24 and pushes the movable sleeve 22 by applying a pushing force, which in turn drives the movable ring 23 to squeeze the coupling agent. The anti-slip texture design improves the stability and convenience of operation, allowing the operator to control the movement of the movable sleeve 22 more easily and ensuring the smooth progress of the coupling agent extrusion operation.
[0034] like Figure 2 , Figure 3 and Figure 6 As shown, the covering mechanism 3 includes a movable shell 31 and a cover frame 32. Both the movable shell 31 and the cover frame 32 are made of transparent material. The operator can observe the coating of the coupling agent inside the covering mechanism 3, the detection position of the belly, and the working status of the rolling mechanism 4 through the transparent movable shell 31 and cover frame 32. This allows the operator to monitor the various situations in the detection process in real time, adjust the operation in a timely manner, and improve the accuracy and reliability of the operation. The cover frame 32 is fixedly fitted on the outer periphery of the annular cylinder 21. The wall of the cover frame 32 has an upward-opening cavity 321. The movable shell 31 slides into the cavity 321 and is connected to a return component. The bottom of the inner periphery of the cover frame 32 has a through hole 322 that communicates with the cavity 321.
[0035] The cover frame 32 is fixed to the outer periphery of the annular cylinder 21, and an upward-opening cavity 321 is opened in the wall. The movable shell 31 slides into the cavity 321 and is connected to the return member. A through hole 322 communicating with the cavity 321 is opened at the bottom of the inner periphery of the cover frame 32. When the covering mechanism 3 covers the belly, the movable shell 31 is blocked by the belly and slides in the cavity 321. The through hole 322 contacts the surface of the belly. When the movable shell 31 moves back, a negative pressure is formed inside the cavity 321. The coupling agent on the edge of the covered belly is absorbed through the through hole 322 and the cavity 321, so as to realize the absorption of the coupling agent on the edge of the covered area, prevent the coupling agent from flowing from the edge, and facilitate the subsequent cleaning of the belly.
[0036] like Figure 3 As shown, the return component includes a guide rod 33 and a return spring 34. One end of the guide rod 33 is connected to the inner wall of the cavity 321, and the other end slides into the interior of the movable shell 31. The return spring 34 is movably sleeved on the outer periphery of the guide rod 33. One end of the return spring 34 is connected to the inner wall of the cavity 321, and the other end is connected to the movable shell 31.
[0037] One end of the guide rod 33 is connected to the inner wall of the cavity 321, and the other end slides into the interior of the movable shell 31. The return spring 34 is sleeved on the outer circumference of the guide rod 33, and its two ends are connected to the inner wall of the cavity 321 and the movable shell 31, respectively. When the movable shell 31 slides in the cavity 321, the return spring 34 is compressed and stores elastic potential energy. When the external pressure disappears, the return spring 34 releases the elastic potential energy and pushes the movable shell 31 to reset along the direction of the guide rod 33. The return spring 34 returns so that the movable shell 31 can automatically reset, so that the coupling agent can be absorbed after detection.
[0038] Furthermore, the bottom of the cover frame 32 is rotatably fitted with multiple balls 35, which are evenly distributed.
[0039] Multiple balls 35 are evenly spaced and rotated around the bottom of the cover frame 32. When the cover mechanism 3 moves on the belly surface, the balls 35 roll on the belly surface, changing the friction between the cover frame 32 and the belly from sliding friction to rolling friction. This significantly reduces the resistance when the cover frame 32 moves, making the fetal heart rate monitor move more flexibly and smoothly on the belly surface. This makes it easier for operators to adjust the detection position and reduces the possibility of coupling agent flow, thereby improving the mobility of the cover mechanism 3 and assisting in the position adjustment, coupling agent coating, and recycling operations during the detection process.
[0040] like Figures 2 to 4 As shown, there are two sets of rolling mechanisms 4, which are symmetrically distributed in a figure-eight shape at the probe of the fetal heart rate monitor body 1. When applying coupling agent, the two sets of rolling mechanisms 4 roll on the belly surface at the same time. When absorbing coupling agent, they also move back symmetrically to absorb it, thus improving work efficiency. The rolling mechanism 4 includes a rotating tube 41, a hollow rod 42, a torsion spring 43, and a rotating joint 44. One end of the hollow rod 42 is rotatably connected to the annular cylinder 21 through the rotating joint 44, and the other end of the hollow rod 42 is rotatably connected to the rotating tube 41. The rotating tube 41 has a hole. The torsion spring 43 is movably sleeved on the outer periphery of the rotating joint 44. One end of the torsion spring 43 is connected to the hollow rod 42, and the other end is connected to the annular cylinder 21.
[0041] One end of the hollow rod 42 is rotatably connected to the annular cylinder 21 via a rotary joint 44, and the other end is rotatably connected to the rotating tube 41. A hole is formed in the rotating tube 41. A torsion spring 43 is sleeved on the outer circumference of the rotary joint 44, with both ends connected to the hollow rod 42 and the annular cylinder 21 respectively. In the first position, the extrusion mechanism 2 delivers the coupling agent to the rotating tube 41 through the rotary joint 44 and the hollow rod 42, releasing it through the hole. The rotating tube 41 rolls against the belly surface, evenly coating the coupling agent. At this time, the torsion spring 43 is in a certain deformed state. In the second position state, the fetal heart rate monitor body 1 gradually moves upward, the external force gradually decreases, the torsion spring 43 releases elastic potential energy, driving the hollow rod 42 to rotate around the rotary joint 44, causing the rotating tube 41 to move back. During the back movement, the push handle 24 moves upward, and the push handle 24 drives the moving ring 23 to move upward, so that a negative pressure extraction space is formed inside the annular cylinder 21. The holes on the rotating tube 41 absorb the coupling agent on the belly, which can be moved to other belly areas for re-rolling and coating during this test for reuse.
[0042] The rotary joint 44 allows the rolling mechanism 4 to rotate flexibly, adapting to rolling and return operations. The torsion spring 43 provides reset power, ensuring that the rolling mechanism 4 can automatically return. The rolling and hole release and suction functions of the rotary tube 41 realize the integrated operation of coating and recycling of coupling agent, improve work efficiency, reduce coupling agent waste and pollution, and facilitate reuse in the subsequent testing.
[0043] Working principle: Positioning of the cover mechanism: Hold the main body 1 of the fetal heart monitor and gently place the cover mechanism 3 on the detection area of the pregnant woman's belly through the ball bearing 35 at the bottom of the cover frame 32. The ball bearing 35 is recessed into the belly under the force, so that the cover frame 32 contacts the belly. Move the main body 1 of the fetal heart monitor down and slide the cover frame 32 into the cavity 321. The return spring 34 is compressed and stored energy. At the same time, the through hole 322 at the bottom of the cover frame 32 fits against the edge of the belly, forming a local blocking area.
[0044] Coupling agent coating: Pushing the push handle 24 causes the moving sleeve 22 and moving ring 23 to slide downwards inside the annular cylinder 21, squeezing the coupling agent so that it flows into the hollow rod 42 through the rotary joint 44 and is finally squeezed out from the hole in the rotating tube 41. The two sets of rolling mechanisms 4 are pressed tightly against the belly surface under the action of the torsion spring 43. The rotating tube 41 rolls with the movement of the fetal heart rate monitor, coating the coupling agent on the detection area. Due to the rolling friction design of the ball 35, the covering mechanism 3 can move flexibly to change the coating position.
[0045] Probe bonding test: After the coupling agent is applied to the rotating tube 41, the probe of the fetal heart rate monitor body 1 is bonded to the belly, and the fetal heart rate monitor body 1 begins to collect fetal heart signals. The transparent cover frame 32 and the movable shell 31 facilitate the observation of the distribution of coupling agent and the position of the probe, ensuring accurate detection. At the same time, the cover frame 32 and the movable shell 31 play a role in blocking external noise from interfering with the use of the fetal heart rate monitor body 1, thus playing an auxiliary noise reduction role.
[0046] Coupling agent recovery initiation: After the test, lift the fetal heart rate monitor body 1, the probe of the fetal heart rate monitor body 1 separates from the belly, the return spring 34 releases elastic potential energy, pushes the moving shell 31 to reset along the guide rod 33, at this time a negative pressure is formed inside the cavity 321, the coupling agent at the edge of the covered area is sucked through the through hole 322, the torsion spring 43 resets and drives the hollow rod 42 to rotate around the rotary joint 44, so that the rotating tube 41 moves back. During the return process, the hole of the rotating tube 41 uses the negative pressure formed by the upward movement of the moving ring 23 in the annular cylinder 21 to suck up the coupling agent on the belly surface, realizing the reuse in one test (if the test is completed and no further tests are conducted, the coupling agent will not be reused). After the push handle 24 resets, the moving ring 23 returns to the initial position, the rolling mechanism 4 returns to the figure-eight unfolded state, and prepares for the next test.
[0047] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.
Claims
1. A portable fetal heart rate monitor with noise reduction function, characterized in that, It includes the main body of the fetal heart rate monitor (1), the squeezing mechanism (2), the covering mechanism (3) and the rolling mechanism (4); The squeezing mechanism (2) is set on the outer periphery of the fetal heart rate monitor body (1), and the covering mechanism (3) covers the belly to form a covering space; The number of the rolling mechanism (4) is two sets, and the two sets of the rolling mechanism (4) are symmetrically arranged with respect to the main body (1) of the fetal heart monitor. The rolling mechanism (4) is connected to the extrusion mechanism (2) and is located in the enclosure space. The extrusion mechanism (2) is provided with a deformation space for storing the coupling agent. When in use, the deformation space becomes smaller and the coupling agent is squeezed into the rolling mechanism (4). As the fetal heart rate monitor body (1) moves down, the covering space becomes smaller, and the rolling mechanism (4) spreads out from the middle to both sides to coat the coupling agent. When the main body (1) of the fetal heart rate monitor moves back, the covering space becomes larger to absorb the coupling agent at the edge of the covering. At the same time, the deformation space becomes larger, the rolling mechanism (4) moves back and closes, and collects the coupling agent.
2. A portable fetal heart rate monitor with noise reduction function according to claim 1, characterized in that: The extrusion mechanism (2) includes an annular cylinder (21), a movable sleeve (22) and a movable ring (23). The annular cylinder (21) is fixedly fitted on the outer periphery of the fetal heart rate monitor body (1). The movable ring (23) is slidably fitted inside the annular cylinder (21) and is fixedly connected to the movable sleeve (22).
3. A portable fetal heart rate monitor with noise reduction function according to claim 2, characterized in that: A push handle (24) is installed on the movable sleeve (22), and there is a gap between the push handle (24) and the fetal heart rate monitor body (1).
4. A portable fetal heart rate monitor with noise reduction function according to claim 2, characterized in that: The covering mechanism (3) includes a movable shell (31) and a cover frame (32). The cover frame (32) is fixedly fitted on the outer periphery of the annular cylinder (21). The wall of the cover frame (32) has an upward-opening cavity (321). The movable shell (31) slides into the cavity (321) and is connected to a return member. The bottom of the inner periphery of the cover frame (32) has a through hole (322) communicating with the cavity (321).
5. A portable fetal heart rate monitor with noise reduction function according to claim 4, characterized in that: The return component includes a guide rod (33) and a return spring (34). One end of the guide rod (33) is connected to the inner wall of the cavity (321), and the other end slides into the interior of the movable shell (31). The return spring (34) is movably sleeved on the outer periphery of the guide rod (33). One end of the return spring (34) is connected to the inner wall of the cavity (321), and the other end is connected to the movable shell (31).
6. A portable fetal heart rate monitor with noise reduction function according to claim 4, characterized in that: The bottom of the cover frame (32) is rotatably fitted with ball bearings (35), and there are multiple ball bearings (35) distributed at equal intervals.
7. A portable fetal heart rate monitor with noise reduction function according to claim 6, characterized in that: The rolling mechanism (4) includes a rotating tube (41), a hollow rod (42), a torsion spring (43), and a rotating joint (44). One end of the hollow rod (42) is rotatably connected to the annular cylinder (21) through the rotating joint (44), and the other end of the hollow rod (42) is rotatably connected to the rotating tube (41). The rotating tube (41) has a hole. The torsion spring (43) is movably sleeved on the outer periphery of the rotating joint (44). One end of the torsion spring (43) is connected to the hollow rod (42), and the other end is connected to the annular cylinder (21).
8. A portable fetal heart rate monitor with noise reduction function according to claim 5, characterized in that: Both the movable shell (31) and the cover frame (32) are made of transparent material.
9. A portable fetal heart rate monitor with noise reduction function according to claim 3, characterized in that: The deformation space is equipped with a heating element, which is arranged in a ring shape.