Application trend of pressure sensor in medical equipment

Medical device designers must consider the difficult problem of withstanding condensing humidity when selecting a pressure sensor. Usually, they need to repeatedly weigh the functional characteristics, package type and cost. In addition to this, apart from the bulky heavy-duty medium-isolated pressure sensors, there are few other sensing options for medical devices. This type of pressure sensor was once the only option before the introduction of circuit board-mounted sensors compatible with liquid media.

For applications with low and medium pressure requirements (including gas / liquid chromatography, chemical analyzers, ventilators and blood analyzers, and diagnostic equipment), the pressure sensor must not only be able to directly contact the liquid medium or tolerate humid environments, It is also necessary to provide highly accurate pressure measurement results for various media such as exhaled gas, reagents, samples, and cleaning fluids. In applications with pressure ranges below 150 psi and in tight spaces, circuit board-mounted pressure sensors are often the solution of choice, and they can do everything in terms of functionality, package size, reliability, and cost.

To obtain the most accurate pressure reading, the sensor should be as close as possible to the medium to be measured. However, not all pressure sensors are compatible with liquid media, which poses a major problem for medical device designers. In many cases, they need to design additional components such as bypass or filters to solve the humidity problem, or reconsider the positioning of the components, especially in the system to set up the pipeline to avoid any fluid contact with the sensor. These tasks require additional design time and cost.

Resistant to liquids and moisture

Nowadays, sensor manufacturers have developed circuit board mounted sensors. These sensors are not only able to isolate the liquid medium and the highly humid environment, suitable for medical equipment with low and medium pressure measurement requirements, but also eliminate the need for designers to design additional protection functions or redesign products (to ensure that the fluid will not contact the sensor) Simplified the design.

In chemical analyzers, pressure sensors need to provide highly accurate and repeatable measurements at low pressures, and need to withstand higher pressures during flushing and cleaning processes.

For example, liquid-medium-compatible circuit board-mounted pressure sensors are a good choice for chemical analyzers. Because chemical analyzers require accurate measurement of liquid flowing through the system in a repeating manner. Generally speaking, in a chemical analyzer, a pipette is used to aspirate the sample liquid, and then the sample is dropped into a sample bottle for mixing or analysis. During this process, the pressure sensor can not only ensure accurate suction of the required sample, but also detect whether the pipette is unobstructed or whether the pipette is correctly placed in the sample bottle.

The pressure sensor must meet the requirements of high-precision measurement and repeatable operation when measuring in a low-pressure environment. At the same time, they must also be able to withstand the higher pressures generated by flushing or cleaning the liquid passage. All of this is premised on direct contact with the liquid medium to be measured.

Examples of such sensors include the 24PC / 26PC circuit board mounted pressure sensors introduced by Honeywell Sensing and Control, which can detect small pressure changes between readings and can accurately measure the flow through the system in a repeatable manner. The specific liquid flow rate ensures that the liquid has flow rate and flow rate data (this is the core point for the operation of analytical equipment). In addition to being used as a pressure sensor that contacts the liquid medium on one side, the differential sensor is also a unique solution that is compatible with liquid media with dual pressure ports.

Multiple options

Honeywell's TruStability pressure sensor series has a wide range of configuration options that can greatly reduce design and development time.

In ventilator applications, circuit board mounted pressure sensors are used to measure the air flow inhaled and exhaled by the patient. In order to ensure that the pressure of air and oxygen does not exceed the value set by the medical staff, the sensor needs to have high stability and high accuracy operation performance. Honeywell's TruStabilityHSC / SSC pressure sensor has extremely strict accuracy and can detect a pressure range as low as 250Pa (1 inch water column), which is perfect for ventilator applications. In addition, these sensors also support I2C or SPI digital output, which can be directly interfaced with a microprocessor or microcontroller, which simplifies the design and improves system performance.

The TruStability sensor has a liquid medium option, so it is suitable for applications that are in direct contact with liquid medium or condensation. When placing the sensor close to the patient, these options are key considerations, especially in the exhalation part of the ventilator. The sensor must withstand the high humidity air caused by the patient's cough and exhalation.

The emergence of 24PC / 26PC and TruStabilityHSC / SSC pressure sensors solves the problem of designers of chemical analyzers, ventilators or other similar types of medical equipment who want to position the pressure sensor as close to the fluid or humid environment as possible to obtain Design ideas for accurate pressure readings. These sensors are not only resistant to various non-corrosive, deionized liquid or gas environments, but also have a large number of specification options, such as pressure range, package type and digital / analog output range, etc., which can provide extremely high flexibility for medical device design .

Since many medical device applications are likely to come into contact with fluids and gases, designers should always prioritize pressure sensors that are compatible with liquid media to simplify design. In addition, they also need to understand the type of fluid that the pressure sensor may contact to ensure that it is compatible with the fluid.

Designers should also consider pressure sensors with fully compensated, amplified, and calibrated features to make operation easier. Because with these sensors, the design of signal conditioning components on the printed circuit board can be avoided, which can bring benefits such as space saving, increased reliability, reduced cost, and simplification.

Match the requirements between the sensor and the application

Of course, in any case, the best choice should be determined according to the application. For example, in applications such as alarm circuits, designers may prefer to select low-cost pressure sensors that are compatible with liquid media and have no amplification and compensation characteristics.

At the same time, look for pressure sensors that are easy to integrate into the design. This means that the device should provide multiple port type, package and output type (analog and digital) options. In addition, the pre-inspection of sensors is also a major advantage to speed up the development and production cycle.

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