Pressure sensor for blood pressure monitor
Currently, all the blood pressure monitors use the ‘’Oscillometric ‘’ method to measure blood pressure. This technique requires neither stethoscope nor microphone to collect the signal from the artery located in the upper arm (or wrist). Unlike analog monitors used in hospitals and clinics by professionals, digital monitors with the oscillometric method do not require any training to users. By applying this new technology, home monitoring by patients became possible.
To advance the benefits realized by this technology, A&D began supplying oscillometric blood pressure monitors for home use since 1984, establishing A&D as a pioneer of its kind.
A&D takes pride in the fact that we have designed and manufactured these sensors internally since the inception of the company.
This technology is powerful, yet simple. When the blood pressure cuff is under deflation after pressurelized to the certain level, a small signal called an oscillometric wave is generated and transferred to the BP monitor through an air line.
A small capacitor type of sensor receives the small signal from the cuff and amplifies it to transmit it to the CPU for wave analysis.
The signal is weak (mV level), therefore, precise response is required against the incoming signals. Therefore, sensing that signal is one of the major factors to the accuracy of the monitor. A&D’s strength is in the design and manufacturer of that critical sensor.
Quality assurance is another critical factor of producing commercial products in mass quantity. These sensors are manufacturered under a temperature controlled clean room and inspected 100% before going to unit assembling line. This 100% inspection system is added assurance of the quality of A&D products.