CN114858338A - Medical special MEMS sensor for multiple pressure measurement modes - Google Patents
Medical special MEMS sensor for multiple pressure measurement modes Download PDFInfo
- Publication number
- CN114858338A CN114858338A CN202210605446.1A CN202210605446A CN114858338A CN 114858338 A CN114858338 A CN 114858338A CN 202210605446 A CN202210605446 A CN 202210605446A CN 114858338 A CN114858338 A CN 114858338A
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- China
- Prior art keywords
- shell
- connector
- luer connector
- medical
- pressure measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M39/105—Multi-channel connectors or couplings, e.g. for connecting multi-lumen tubes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/223—Multiway valves
Abstract
The invention provides a medical special MEMS sensor for multiple pressure measurement modes, which comprises a connector shell, wherein a channel is formed in the connector shell, a sensing device is arranged in the channel, a first luer connector and a second luer connector which are communicated with the channel are respectively arranged at two ends of the connector shell, switch valves are respectively arranged on the first luer connector and the second luer connector, and pins are embedded in the connector shell. The invention can realize flexible conversion of multiple pressure measurement modes by setting the opening and closing of the switch valve, the connection mode and the control of reference pressure, and is directly connected with medical equipment through the luer connector, thereby effectively improving the convenience and reliability of connection and the accuracy of measurement and enhancing the specificity of the device in the medical field.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a medical special MEMS sensor for multiple pressure measurement modes.
Background
In recent years, sensing technology has been widely used in various fields of medical health. In medical monitoring, various medical pressure sensors have been invented to monitor pressure information of human body or medical equipment or instruments. For example: invasive or non-invasive blood pressure monitors, intracranial pressure monitoring devices, ventilators, and ECMOs, etc., all utilize pressure sensors to read key pressure parameters.
Pressure monitoring modes commonly used in medical treatment include gauge pressure measurement, differential pressure measurement, absolute pressure measurement, and the like. Different pressure measurement modes are often needed in different monitoring scenes, and switching is often needed, for example, the monitoring of human blood pressure is gauge pressure measurement; the membrane lung state recognition in the ECMO system relies on differential pressure monitoring at both ends.
The existing MEMS pressure sensor structure mainly comprises a sensing chip and a package with a round-head interface, wherein the package transmits external pressure to the sensing chip through the round-head interface to sense the pressure, the pressure sensing type of the package depends on the type of the sensing chip, and therefore the monitoring mode is relatively cured. Luer connectors are adopted in the medical industry as a standardized connection mode, so that if the existing MEMS pressure sensor needs to be connected to medical equipment or instruments for pressure monitoring, an adapter is needed to be respectively connected with a round-head interface on the MEMS pressure sensor package and the luer connectors on the medical equipment or instruments. Such as a conventional plastic catheter, having one end connected to the round-head interface of the MEMS pressure sensor by interference fit and the other end connected to a medical device or instrument luer.
In summary, the conventional MEMS pressure sensor structure is not commonly connected to medical equipment, has a single pressure measurement mode and low flexibility, and may have problems of breakage, air leakage, measurement error and the like after long-term use.
Disclosure of Invention
The invention aims to provide a medical special MEMS sensor for multiple pressure measurement modes, which overcomes the defects that the traditional medical pressure sensor can only carry out single pressure mode measurement and can be connected with medical equipment or instruments only by an additional adapter in the using process, and greatly improves the convenience and reliability of connection and the accuracy of measurement.
The invention provides a medical special MEMS sensor for multiple pressure measurement modes, which comprises a connector shell, wherein a channel is formed in the connector shell, a sensing device is arranged in the channel, a first Ruhr joint and a second Ruhr joint which are communicated with the channel are respectively arranged at two ends of the connector shell, switch valves are respectively arranged on the first Ruhr joint and the second Ruhr joint, and pins are embedded in the connector shell.
Further, the first and second luer fittings are both male luer fittings.
Further, the first luer connector and the second luer connector are both female luer connectors.
Further, the first luer connector is a male luer connector, and the second luer connector is a female luer connector.
Furthermore, the sensing device comprises a sensing chip and a packaging layer coated outside the sensing chip, and the sensing device is fixed on the inner wall of the channel.
Further, one end of the pin extends to the outside of the connector housing.
Furthermore, one end of the pin, which is located inside the connector shell, is electrically connected with the sensing chip.
Further, the connector housing comprises a first housing connected with the first luer connector and a second housing connected with the second luer connector, and the first housing and the second housing are detachably connected.
Furthermore, a plurality of pins are arranged on the surface of the first shell close to the second shell, a plurality of clamping grooves correspondingly matched with the pins are arranged on the surface of the second shell close to the first shell, and the first shell and the second shell are connected through the pins and the clamping grooves.
Further, a gasket layer is arranged between the first shell and the second shell.
The invention is directly connected with the medical equipment through the luer connector, replaces the traditional mode of needing an adapter, effectively improves the convenience and reliability of connection and the accuracy of measurement, can realize the measurement of multiple pressure modes by setting the switch valve and the reference pressure, and improves the universality of the equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the internal structure of embodiment 1 of the present invention;
FIG. 3 is a circuit diagram of the signal processing circuit of the present invention;
FIG. 4 is a schematic view of the internal structure of embodiment 2 of the present invention;
FIG. 5 is a schematic view of the internal structure of embodiment 3 of the present invention;
description of reference numerals:
in the figure: 1-male luer connector, 2-first switch valve, 3-first shell, 4-channel, 5-pin, 6-upper package, 7-silicon-based piezoresistive pressure sensing chip, 8-lower package, 9-second shell, 10-pin, 11-second switch valve and 12-female luer connector;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1-3:
a medical special MEMS sensor with multiple pressure measurement modes comprises a joint shell formed by splicing a first shell 3 and a second shell 9, wherein a channel 4 is formed in the joint shell.
The first shell 3 and the second shell 9 are detachably connected, four pins 5 are arranged on the surface, close to the second shell 9, of the first shell 3, four clamping grooves corresponding to the pins 5 are arranged on the surface, close to the first shell 3, of the second shell 9, and the first shell 3 and the second shell 9 are connected through the pins 5 and the clamping grooves.
Be provided with the seal cushion layer between first shell 3 and the second shell 9, avoid first shell 3 and second shell 9 to connect the liquid or the gaseous leakage in the back passageway 4, influence the pressure measurement error.
Be provided with sensing device in the passageway 4, sensing device includes sensing chip and cladding at silica-based piezoresistive pressure sensing chip 7 outside last encapsulation 6 and encapsulation 8 down, and the sensing chip in this embodiment chooses silica-based piezoresistive pressure sensing chip 7 for use, and silica-based piezoresistive pressure sensing chip 7 encapsulates inside the joint shell through packaging technology such as paster and lead bonding, and sensing device places at passageway 4 inner wall perpendicularly, carries out pressure monitoring.
The side of second shell 9 is embedded with pin 10, and the one end of pin 10 extends to the second shell 9 outside, and the one end that lies in the shell inside on pin 10 is connected with silicon-based piezoresistive pressure sensing chip 7 electric connection, measures the pressure value size when sensing device, gives external signal processing circuit with data transmission through pin 10.
A rubber ring is arranged in the pipeline of the luer connector, so that gas or liquid in the pipeline is further prevented from leaking.
Luer connectors communicated with the channel 4 are respectively arranged at two ends of the shell and comprise a male luer connector 1 connected with the first shell 3 and a female luer connector 12 connected with the second shell 9, a first switch valve 2 is arranged on the male luer connector 1, and a second switch valve 11 is arranged on the female luer connector 12.
The male luer fitting 1 is provided with external threads and the female luer fitting 12 is provided with internal threads.
In the actual use process, an operator can freely select and connect the male luer 1 or the female luer 12 according to the type of the luer on the medical equipment or the instrument, and open the corresponding first switch valve 2 or the corresponding second switch valve 11 for pressure transmission.
The switching of four pressure measurement modes can be realized by setting the switching and connecting modes of the switch valve and controlling the reference pressure: gauge pressure mode, absolute pressure mode, relative pressure mode, and differential pressure mode.
In the gauge pressure measuring mode, after the medical equipment or the instrument is connected with the male luer 1 or the female luer 12, the corresponding switch valve is opened, and the switch valve at the other side is kept communicated with the atmosphere, so that the measured pressure is a gauge pressure value relative to the atmospheric pressure.
In the absolute pressure measuring mode, after the non-connecting end luer connector is vacuumized, the switch valve is closed to maintain the vacuum state in the corresponding shell, and after the medical equipment or the instrument is connected with the male luer connector 1 or the female luer connector 12, the corresponding switch valve is opened, so that the measured pressure is the absolute pressure value relative to the vacuum.
In the relative pressure measuring mode, the switch valve is closed after the non-connecting end luer connector is pumped or pressurized so as to maintain the reference pressure in the corresponding shell, and the medical equipment or the instrument is connected with the male luer connector 1 or the female luer connector 12 and then is opened so that the measured pressure is the relative pressure value.
In the differential pressure mode, the medical equipment or instrument simultaneously turns on the luer connectors at the two ends of the sensor and opens the first switch valve 2 and the second switch valve 11, so that the measured pressure is the differential pressure value at the two ends.
As shown in fig. 3, the signal processing circuit of the present invention includes four operational amplifiers (such as OP07, OPA227, LM358, etc.) and a filter circuit for voltage stabilization, amplification, and filtering, an analog/digital conversion chip (such as AD9220, AD7192, etc.) and a peripheral circuit for analog-to-digital conversion, and a single chip (such as STM32, GD32, etc.) and its peripheral circuit for data processing and display.
Because the output signal of the silicon-based piezoresistive pressure sensor chip is in the mV level and is not easy to directly acquire and process, the signal needs to be amplified to the V level for processing. The selected chip die has a Wheatstone bridge structure and has a positive output pin and a negative output pin. Therefore, in the interface circuit, the two output ends are connected with the voltage followers to stabilize the input voltage, a differential amplification circuit is constructed, the amplification of signals is realized through the middle-stage operational amplifier, the amplification factor is determined by the ratio of the feedback branch resistance to the input resistance, and the amplified signals are output to be subjected to next-stage second-order filtering and then pass through the output voltage followers to obtain analog signals processed by the front-end circuit. The second-order filter circuit is composed of a resistor and a capacitor, the frequency band of noise can be determined by performing fast Fourier transform on signals through an oscilloscope, the noise of a corresponding frequency band is filtered by modifying the resistance capacitance value of the second-order filter circuit through the relation between cut-off frequency and the capacitor resistor, and finally, the filtered signals are output after being stabilized through a voltage follower.
Aiming at the problem that an upper computer reads the number of a sensor, an analog signal processed at the front end is converted into a digital signal through an analog/digital conversion chip and is sent to a single chip microcomputer through any one communication protocol (such as SP I, I2C and the like), and the single chip microcomputer is used for sampling the digital signal and then sending the digital signal to the upper computer for display through a certain communication mode (such as USART, UART, USB, RS232 and the like).
Example 2
As shown in fig. 4, in this embodiment, the luer connectors provided at both ends of the housing and respectively connected to the channel 4 are male luer connectors 1, and other structures are the same as those in embodiment 1.
Example 3
As shown in fig. 5, in this embodiment, the luer connectors provided at both ends of the housing and communicating with the channel 4 are female luer connectors 12, but other structures are the same as those of embodiment 1.
The invention is directly connected with the medical equipment through the luer connector, replaces the traditional mode that an adapter is additionally used, effectively improves the convenience and reliability of connection and the accuracy of measurement, and enhances the specificity of the MEMS sensor in the medical field; the switching and connecting modes of the switch valve and the control of the reference pressure are set, so that the multi-pressure measurement mode and the flexible conversion among the multi-pressure measurement mode and the reference pressure are realized; by arranging the sealing cushion layer between the first shell and the second shell and the rubber ring in the luer connector, the phenomenon that gas or liquid leaks in a channel or the luer connector to generate measurement errors is avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A medical-specific MEMS sensor for multiple pressure measurement modes, characterized by: the connector comprises a connector shell, a channel is formed in the connector shell, a sensing device is arranged in the channel, a first luer connector and a second luer connector which are communicated with the channel are respectively arranged at two ends of the connector shell, switch valves are respectively arranged on the first luer connector and the second luer connector, and pins are embedded in the connector shell.
2. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 1, wherein: the first luer connector and the second luer connector are both male luer connectors.
3. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 1, wherein: the first luer connector and the second luer connector are both female luer connectors.
4. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 1, wherein: the first luer connector is a male luer connector, and the second luer connector is a female luer connector.
5. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 1, wherein: the sensing device comprises a sensing chip and a packaging layer coated outside the sensing chip, and the sensing device is fixed on the inner wall of the channel.
6. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 5, wherein: one end of the pin extends to the outside of the connector housing.
7. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 6, wherein: the pin is located the inside one end of joint shell and with sensing chip electric connection.
8. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 1, wherein: the connector shell comprises a first shell connected with the first luer connector and a second shell connected with the second luer connector, and the first shell and the second shell are detachably connected.
9. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 8, wherein: the surface of the first shell, which is close to the second shell, is provided with a plurality of pins, the surface of the second shell, which is close to the first shell, is provided with a plurality of clamping grooves correspondingly matched with the pins, and the first shell and the second shell are connected through the pins and the clamping grooves.
10. The medical-specific MEMS sensor for multiple pressure measurement modes according to claim 8, wherein: and a sealing cushion layer is arranged between the first shell and the second shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210605446.1A CN114858338A (en) | 2022-05-30 | 2022-05-30 | Medical special MEMS sensor for multiple pressure measurement modes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210605446.1A CN114858338A (en) | 2022-05-30 | 2022-05-30 | Medical special MEMS sensor for multiple pressure measurement modes |
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| Publication Number | Publication Date |
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| CN114858338A true CN114858338A (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210605446.1A Pending CN114858338A (en) | 2022-05-30 | 2022-05-30 | Medical special MEMS sensor for multiple pressure measurement modes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355955A (en) * | 2022-10-24 | 2022-11-18 | 河北美泰电子科技有限公司 | MEMS temperature acceleration composite sensor |
-
2022
- 2022-05-30 CN CN202210605446.1A patent/CN114858338A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355955A (en) * | 2022-10-24 | 2022-11-18 | 河北美泰电子科技有限公司 | MEMS temperature acceleration composite sensor |
| CN115355955B (en) * | 2022-10-24 | 2023-01-10 | 河北美泰电子科技有限公司 | MEMS temperature acceleration composite sensor |
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