High-sensitivity medical pressure gauge

Abstract

The utility model discloses a high sensitivity medical pressure gauge relates to medical pressure gauge technical field, including the watch case, the watch case one end is inlayed and is equipped with the display window, the watch case is in the direction of being close to display window and is provided with sealed plate no.

Description

Technical Field

[0001] This utility model relates to the field of medical pressure gauge technology, specifically a high-sensitivity medical pressure gauge. Background Technology

[0002] A pressure gauge is an instrument that displays pressure by transmitting the pressure deformation to a pointer through the elastic deformation of a sensitive element within the gauge and the conversion mechanism within the gauge's internal movement. Pressure gauges are widely used not only in various industrial processes and scientific research fields, but also for monitoring pressure in many medical procedures, such as medical oxygen pressure gauges, medical catheter balloon pressure gauges, and medical negative pressure suction device pressure gauges.

[0003] Medical pressure gauges must prevent the measured medium (such as blood or medicine) from entering the instrument and causing contamination or cross-infection. Existing isolation membrane structures are prone to measurement distortion during pressure transmission. Traditional pressure transmission structures are slow to respond to micro-pressure changes, and liquid flow impacts can easily generate differential pressure errors, affecting the accuracy of high-sensitivity measurements. Environmental temperature differences can cause the transmission fluid to expand / contract, generating additional pressure interference signals and reducing reading stability.

[0004] Therefore, it is necessary to design a high-sensitivity medical pressure gauge to improve the accuracy and sensitivity of medical pressure gauge detection. Utility Model Content

[0005] The purpose of this invention is to provide a highly sensitive medical pressure gauge to address the shortcomings of existing technologies and solve the problems mentioned in the background section.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a high-sensitivity medical pressure gauge, including a housing, a display window embedded at one end of the housing, a sealing plate one and a sealing plate two arranged sequentially inside the housing along the direction near the display window, the sealing plate one and the sealing plate two dividing the interior of the housing along the direction near the display window to form an isolation cavity, a transmission cavity and a sensing cavity, a digital display module being provided in the sensing cavity, a ring being provided in the transmission cavity, the ring dividing the transmission cavity to form an independent pressure cavity and an equalization cavity, a plurality of microchannels connecting the pressure cavity and the equalization cavity being provided on the ring, a compensation membrane being provided on the side of the equalization cavity near the sealing plate two, the pressure cavity, the microchannels and the equalization cavity facing the sealing plate two being filled with a transmission fluid, an isolation membrane being embedded on the sealing plate one, a circular hole two being opened on the sealing plate two, a pressure sensor being sealed and contacted on the side of the circular hole two away from the transmission cavity, and the pressure sensor being signal-connected to the digital display module.

[0007] The present invention further explains that the digital display module includes an LCD screen and a central processing unit. The output end of the LCD screen faces the display window. A substrate is disposed inside the sensing cavity. The central processing unit is fixedly connected to the side of the substrate close to the LCD screen. The pressure sensor is fixedly connected to the side of the substrate away from the LCD screen. The output end of the pressure sensor is signal-connected to the central processing unit.

[0008] The present invention further explains that a connecting pipe is connected to the side of the watch case away from the display window, and the connecting pipe is in communication with the isolation cavity.

[0009] The present invention further describes that the sealing plate has a circular hole, and an isolation membrane is embedded in the circular hole.

[0010] The present invention further explains that the diameter of the microchannel is no greater than 1 mm, and the plurality of microchannels are evenly distributed in a circle with the center of the pressure chamber as the center.

[0011] This utility model further illustrates that the inner diameters of the first circular hole, the second circular hole, and the pressure chamber are the same.

[0012] The present invention further illustrates that the two ends of the ring along its axis are fixedly connected to sealing plate one and sealing plate two, respectively.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are: by setting up an isolation cavity and an isolation membrane, this utility model completely isolates the measured medium, ensuring zero pollution of the internal components of the sensing cavity and meeting medical hygiene standards.

[0014] By setting up microchannels, the transmission fluid is made to flow statically, eliminating differential pressure errors caused by pressure shocks and ensuring that pressure is transmitted to the sensor without loss.

[0015] The transfer liquid, extruded by the deformation of the isolation membrane, flows into the equalization chamber through the microchannel. The elastic deformation of the compensation membrane adaptively accommodates the liquid, preventing changes in the volume of the transfer liquid from interfering with the pressure of the main pressure chamber. At the same time, the compensation membrane automatically compensates for the thermal expansion / contraction of the transfer liquid, suppressing the temperature drift effect and ensuring measurement stability across the entire temperature range. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the side cross-sectional structure of the watch case of this utility model;

[0019] In the diagram: 1. Case; 2. Display window; 3. Connecting pipe; 4. Digital display module; 5. LCD screen; 7. Central processing unit; 8. Substrate; 9. Pressure sensor; 10. Sealing plate one; 11. Sealing plate two; 12. Isolation chamber; 14. Sensing chamber; 15. Circular hole one; 16. Isolation membrane; 17. Circular ring; 18. Pressure chamber; 19. Equalization chamber; 20. Microchannel; 21. Compensation membrane; 22. Circular hole two. Detailed Implementation

[0020] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-2 The present invention provides a technical solution: a high-sensitivity medical pressure gauge, including a housing 1, a display window 2 embedded at one end of the housing 1, a connecting pipe 3 connected to the side of the housing 1 away from the display window 2, a sealing plate 10 and a sealing plate 11 arranged sequentially inside the housing 1 along the direction close to the display window 2, the sealing plate 10 and the sealing plate 11 dividing the inside of the housing 1 sequentially along the direction close to the display window 2 to form an isolation cavity 12, a transmission cavity and a sensing cavity 14, and the connecting pipe 3 is connected to the isolation cavity 12.

[0022] The sensing cavity 14 is equipped with a digital display module 4, which includes an LCD screen 5 and a central processing unit 7.

[0023] The output end of the LCD screen 5 faces the display window 2 and is used to display the pressure gauge value. The central processing unit 7 is located on the side of the LCD screen 5 away from the display window 2.

[0024] A substrate 8 is disposed inside the sensing cavity 14, and a central processing unit 7 is fixedly connected to the side of the substrate 8 near the LCD screen 5.

[0025] A pressure sensor 9 is installed inside the sensing cavity 14. The pressure sensor 9 is a silicon piezoresistive pressure sensor. The pressure sensor 9 is fixedly connected to the side of the substrate 8 away from the LCD screen 5. The output terminal of the pressure sensor 9 is connected to the central processing unit 7.

[0026] A circular hole 15 is provided on the sealing plate 10. An isolation membrane 16 is embedded in the circular hole 15. The isolation membrane 16 seals the circular hole 15. The isolation membrane 16 has elastic deformation and protrudes to one side of the transmission cavity under the action of medium pressure.

[0027] A circular ring 17 is provided inside the transmission cavity. The two ends of the circular ring 17 along its axis are fixedly connected to the sealing plate 10 and the sealing plate 11 respectively. The circular ring 17 divides the transmission cavity into a pressure cavity 18 and an equalization cavity 19. The pressure cavity 18 is cylindrical and located at the center of the transmission cavity. The equalization cavity 19 is circular in the shape of the circular ring 17 and is concentrically arranged with the pressure cavity 18.

[0028] Multiple microchannels 20 are provided on the ring 17. The diameter of each microchannel 20 is no greater than 1 mm. The multiple microchannels 20 are evenly distributed in a circle with the center of the pressure chamber 18 as the center. All the multiple microchannels 20 connect the pressure chamber 18 and the equalization chamber 19.

[0029] A compensation membrane 21 is provided on the side of the equalization cavity 19 near the sealing plate 10. The compensation membrane 21 is made of the same material as the isolation membrane 16 and both have the effect of producing elastic deformation.

[0030] The pressure chamber 18, the microchannel 20, and the equalization chamber 19 on the side of the compensation membrane 21 facing the sealing plate 11 are filled with a transfer fluid, which is high-purity silicone oil or fluorinated liquid.

[0031] A circular hole 22 is provided on the sealing plate 21. One side of the pressure sensor 9 is sealed to the sealing plate 21, so that the contact end of the pressure sensor 9 is in sealed contact with the circular hole 22. In this way, the pressure is transmitted to the contact end of the pressure sensor 9 through the transmission fluid, and the pressure sensor 9 converts the pressure into an electrical signal and outputs it to the central processing unit 7. Finally, the central processing unit 7 displays it through the LCD screen 5.

[0032] Among them, the inner diameters of the first round hole 15, the second round hole 22, and the pressure chamber 18 are the same, and the inner diameter size is 15% of the inner diameter of the case 1.

[0033] In this embodiment, the pressure gauge is connected to the pipe or container of the medium to be measured through a connecting pipe. After the medium enters the isolation chamber 12 through the connecting pipe 3, it applies pressure to the isolation membrane 16, causing it to bulge out to the side of the pressure chamber 18.

[0034] The transfer fluid in the pressure chamber 18 transmits pressure to the pressure sensor 9. During this process, the initial deformation of the isolation membrane 16 causes a small amount of transfer fluid to flow into the equalization chamber 19 through the microchannel 20 with a diameter ≤1mm, and is contained by the elastic deformation of the compensation membrane 21. However, due to the small size of the microchannel 20, the flow rate of the transfer fluid is limited, ensuring that the pressure is transmitted to the pressure sensor 9 instantaneously. Moreover, the transfer fluid maintains laminar flow during the transfer process, and the resulting pressure drop is negligible. Therefore, there is almost no pressure difference between the pressure chamber 18 and the equalization chamber 19. The deformation of the compensation membrane 21 will not interfere with the pressure measurement value of the pressure chamber 18. After the pressure stabilizes, the compensation membrane 21 stops deforming to maintain constant pressure.

[0035] Therefore, the function of the compensation membrane 21 is to accommodate the volume displacement of the transfer fluid, rather than to regulate the pressure. In addition, when the ambient temperature changes cause the transfer fluid to expand or contract, the compensation membrane can also adaptively deform to compensate for the volume, preventing the temperature change from causing the transfer fluid to change volume, which would cause the transfer fluid to directly press the pressure sensor 9, resulting in erroneous readings (such as overpressure or underpressure) and reducing the measurement accuracy.

[0036] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-sensitivity medical pressure gauge, characterized in that: Includes a watch case (1), one end of which is fitted with a display window (2). Inside the watch case (1), along the direction close to the display window (2), a sealing plate one (10) and a sealing plate two (11) are arranged in sequence. The sealing plate one (10) and the sealing plate two (11) divide the inside of the watch case (1) along the direction close to the display window (2) to form an isolation cavity (12), a transmission cavity, and a sensing cavity (14). The sensing cavity (14) is provided with a digital display module (4). The transmission cavity is provided with a ring (17). The ring (17) divides the transmission cavity to form an independent pressure cavity (18) and an equalization cavity (19). The first sealing plate (10) has a microchannel (20) that connects the pressure chamber (18) and the equalization chamber (19). The equalization chamber (19) is provided with a compensation membrane (21) on the side near the second sealing plate (11). The pressure chamber (18), the microchannel (20) and the compensation membrane (21) are filled with a transfer fluid in the equalization chamber (19) on the side facing the second sealing plate (11). The first sealing plate (10) is provided with an isolation membrane (16). The second sealing plate (11) is provided with a circular hole (22). The side of the circular hole (22) away from the transfer chamber is sealed to a pressure sensor (9). The pressure sensor (9) is connected to the digital display module (4) for signal transmission.

2. The high-sensitivity medical pressure gauge according to claim 1, characterized in that: The digital display module (4) includes an LCD screen (5) and a central processing unit (7). The output end of the LCD screen (5) faces the display window (2). A substrate (8) is disposed in the sensing cavity (14). The central processing unit (7) is fixedly connected to the side of the substrate (8) close to the LCD screen (5). The pressure sensor (9) is fixedly connected to the side of the substrate (8) away from the LCD screen (5). The output end of the pressure sensor (9) is signal-connected to the central processing unit (7).

3. A high-sensitivity medical pressure gauge according to claim 2, characterized in that: The side of the watch case (1) away from the display window (2) is connected to a connecting pipe (3), which is in communication with the isolation cavity (12).

4. A high-sensitivity medical pressure gauge according to claim 3, characterized in that: The sealing plate (10) has a circular hole (15) and an isolation membrane (16) is embedded in the circular hole (15).

5. A high-sensitivity medical pressure gauge according to claim 4, characterized in that: The diameter of the microchannel (20) is no greater than 1 mm, and the multiple microchannels (20) are evenly distributed in a circle with the center of the pressure chamber (18) as the center.

6. A high-sensitivity medical pressure gauge according to claim 5, characterized in that: The inner diameters of the first circular hole (15), the second circular hole (22), and the pressure chamber (18) are the same.

7. A high-sensitivity medical pressure gauge according to claim 6, characterized in that: The ring (17) is fixedly connected to sealing plate one (10) and sealing plate two (11) at both ends along its axis.

Images